Red Head Tapajos Eartheater (Geophagus sp.)

Red Head Tapajos Eartheater at a glance

The Red Head Tapajos Eartheater (Geophagus sp.) is a South American cichlid named for its warm orange-red head, which in the photograph sits above flanks of shimmering blue-green scales. It belongs to Geophagus, one of the fish popularly called eartheaters because they feed by taking mouthfuls of sediment and sifting out anything edible. That habit shapes almost every decision about keeping one, from the floor of the aquarium to the way you feed it and the companions you choose.

That behaviour is also much of the appeal. Rather than hanging in open water, an eartheater works steadily across the floor, and an aquarium laid out with open sand shows this off far better than one crowded with decor. It is a fish to plan an aquarium around, not one to add as an afterthought to a tank that already exists.

The exact species has not been identified, so the care advice here follows the genus Geophagus and its care group. That care group is the American cichlids, and the water and aquarium figures on this page come from UK trade guidance written for the whole group. Where the genus could mean a larger fish, we plan for the larger fish.

What you receive

Each purchase is one live fish of the size you choose. The size you select is the size supplied, not the adult size. The three sizes on this page are 4–5 cm, 5–6 cm and 7–8 cm, measured when the fish leaves us. All three are well below what the genus can reach: its largest species grow up to 28 cm in standard length, so even the biggest dispatch size may have a great deal of growing ahead of it.

Sex is guaranteed only when the selected option explicitly states male or female. This Red Head Tapajos Eartheater listing has no sex-guaranteed option. Choose it for itself rather than as a planned male or female.

Choosing a size

The three sizes are the same trade form at different lengths when sent. None of them changes the aquarium you need, because that is planned for the adult fish. A smaller fish simply does more of its growing in your care.

Three things that decide success

• Space for a fish of unknown adult size. The genus includes large species, so the aquarium is planned for a large fish from the start.
• A floor it can use. Fine sand with open areas lets an eartheater feed the way its sifting habit needs.
• Companions chosen, not assumed. Temperament varies across American cichlids, so the mix is planned in advance and watched once it is in place.

Is it the right fish for your aquarium?

The photograph shows the look the trade name refers to: an orange-red head and face, rows of iridescent blue-green scales, faint darker bars and a dark blotch in the middle of the flank, with long pelvic fins trailing below. Gallery images have been digitally enhanced to improve image quality. Natural colour, pattern, size and maturity can vary between live animals.

Before you order

• Have an aquarium of around 300 litres or more running, filtered and mature before the fish arrives.
• Give it a floor of fine sand with open space to forage.
• Check your water against the guidance in the care tab, especially ammonia and nitrite, which should read zero.
• Choose companions first, using the compatibility tab, rather than fitting the eartheater into an existing mix.
• Plan to be at home when the parcel arrives and to film it being opened.

If you are still comparing fish for a South American set-up, you can browse our South American cichlids to weigh this eartheater against other cichlids from the same continent before you decide.

The name, the genus and how eartheaters feed

The trade name has three parts. "Red Head" is the colour. "Tapajos" points to the Rio Tapajós, a river in Brazil; it tells you where the name comes from, but a trade name is a label rather than a documented collecting record for any particular fish. "Eartheater" is the popular name for the group that Geophagus belongs to, and it describes the behaviour you will watch every day.

An accepted genus without a species name

Geophagus is an accepted genus in the cichlid family, Cichlidae, as the World Register of Marine Species record for Geophagus shows. The "sp." after the genus name means the fish has been placed in Geophagus without being matched to a named species. It is an honest label: the genus is settled, the species is not, and that is why the care on this page is written for the genus and its care group rather than for one species.

Where Geophagus live

Geophagus species live mainly in South America, as far south as Argentina and Uruguay, and one species is recorded from Panama. They are found in a wide range of freshwater habitats. That spread explains why the wild conditions of one population cannot simply be copied onto a fish whose species is unknown. Steady aquarium conditions within the care-group guidance are the better aim.

How an eartheater feeds

Eartheaters mostly feed by picking up mouthfuls of sediment and sifting out food items such as invertebrates, plant material and detritus, as the Wikipedia summary of the genus Geophagus describes. In the aquarium this looks like repeated foraging along the floor: the fish dips its head to the sand, takes a mouthful, sorts through it and lets the sand fall away before moving on and starting again.

That behaviour has practical consequences for the way you set up and run the tank:

• The floor is a feeding area. Fine sand lets the fish sift in the way its feeding habit suggests; a floor it cannot work through gives it nothing to do.
• Food needs to reach the bottom. Sinking foods arrive where an eartheater looks for them, rather than being taken in mid-water by faster fish.
• Open sand matters. Keep broad stretches of the floor clear rather than covering it with rock, wood and plant pots.
• Small invertebrates are food. Tiny shrimp or snails living on the sand belong to the same category as the invertebrates eartheaters sift out in the wild.
• Size is a genus question. The largest Geophagus reach up to 28 cm in standard length, so the tank should be planned for a large fish.

Planning the aquarium

Set the aquarium up for the fish this will become rather than the fish that arrives. OATA advice for American cichlids is to buy, within reason, as large an aquarium as possible. It gives two planning figures: at least 120 litres for a pair of the smaller species, those under 15 cm, and at least a 300 litre aquarium for the larger or more aggressive species over 15 cm. With the largest Geophagus reaching up to 28 cm in standard length and this fish not matched to a species, plan around the larger figure of 300 litres.

A worked example

An aquarium measuring 120 × 50 × 50 cm holds about 300 litres before any sand or decor goes in, and gives a floor of 120 by 50 cm to forage across. Sand, rock and wood take up part of that volume, so the same tank holds a little less water once furnished. If you are choosing between two tanks of similar volume for an eartheater, pick the longer and wider one over the taller one.

Why a bigger tank is easier to run

The larger the aquarium, the more stable conditions such as temperature and water quality will be. A big volume dilutes waste between water changes and changes temperature more slowly, which gives you time to notice and correct a problem before it affects the fish.

Shape and floor space

For a fish that spends much of its day working through the sand, floor area is more useful than height. A long footprint gives it more ground to forage and gives companions room to keep their distance. Keep a broad strip of open sand along the front, so feeding is easy to watch and food is easy to find.

Sand, plants and cover

OATA recommends fine aquarium gravel or sand for American cichlids, because many species will dig or sift the substrate when feeding or breeding. For an eartheater, fine sand is the natural choice. American cichlids may also dig up or eat live plants, and OATA suggests plastic plants as a suitable way to provide cover. If you prefer living plants, place them where uprooting will not ruin the layout, and be ready to replant.

Filtration

Whatever the size of the aquarium, a filter is always essential. Fish release ammonia, which is toxic, and a working biological filter is what deals with it. Choose a filter suited to the full volume of the aquarium, keep it running continuously and maintain it on a regular routine.

Mature the tank first

A new filter needs time to build up the beneficial bacteria that process waste. Adding fish before that population exists, or stocking too quickly, can result in what OATA calls new tank syndrome: not enough nitrifying bacteria to cope with the waste, unhealthy levels of ammonia and nitrite, and fish that may become ill and die. Our step-by-step guide to setting up and maturing a first tropical tank walks through the process from empty glass to ready aquarium.

Equipment checklist

• An aquarium of around 300 litres or more, with a long footprint.
• A filter matched to that volume, matured before the fish arrives.
• A heater and thermometer to hold the water within 22–27°C.
• Fine sand, with open areas for foraging.
• Plastic plants, or live plants you are happy to replant, for cover.
• Test kits for ammonia, nitrite, nitrate and pH.
• Tap water conditioner and a siphon for water changes.

Water values and testing

The figures below come from the OATA care sheet for American cichlids. OATA describes them as a general guide for the group and advises checking for any species-specific needs; as this fish has not been matched to a species, the group figures are the sound basis for planning. Aim for steady readings inside these ranges rather than chasing one exact number.

OATA notes that American cichlids are usually undemanding of water chemistry. Test a sample of your own conditioned tap water for pH, general hardness and carbonate hardness before the fish arrives, so you know where you are starting from. If the readings already sit inside the ranges above, the simplest plan is to keep them there with regular water changes rather than trying to adjust the chemistry. Steady water that stays within the range serves the fish better than repeated corrections.

Why ammonia and nitrite must read zero

Fish release ammonia into the water. In a working biological filter, beneficial bacteria convert ammonia to nitrite, which is also toxic, and then to nitrate, which is safer; the RSPCA guidance on aquarium environments sets out the same chain. Good husbandry is essential, as American cichlids can be stressed by even the smallest amounts of ammonia. A reading above zero for ammonia or nitrite is a signal to act, not to wait.

A testing routine

Test the water regularly, at least once per week, so ammonia and nitrite never have the chance to build up unnoticed. Keep a simple note of each reading: a slow rise in nitrate or a drifting pH is far easier to spot on paper than by memory.

If the numbers are new to you, our guide to aquarium water parameters and what to test explains what each reading measures and why it matters. You can also enter your own results into our water parameter matcher to compare them with the guidance above before you order.

Temperature

Hold the aquarium steady within 22–27°C using a heater with a thermostat, and confirm it with a separate thermometer that you can read at a glance. Check it when you feed, so a failed heater is noticed within a day rather than at the next water change.

Weekly maintenance

OATA strongly recommends a 25% partial water change at least once every week. For a fish that lives on the floor and sifts it constantly, removing solid waste from the sand matters as much as replacing the water. A simple weekly order of work keeps the job quick:

1. Test the aquarium water before you start, so you know how the week has gone.
2. Siphon out a quarter of the water, drawing solid waste from the sand as you go. Hold the siphon just above the surface so it lifts waste rather than the sand itself.
3. Treat the replacement water with a tap water conditioner to remove any chlorine or chloramine before it goes into the aquarium.
4. Check the filter for blockages.
5. If the filter media needs cleaning, rinse it lightly in some of the aquarium water you have just removed. Never run it under the tap, because any chlorine or chloramine present may kill the beneficial bacteria living in the media.
6. Refill with the conditioned water and check the temperature once the aquarium has settled.

Between water changes, a daily look at the fish, the thermometer and the filter output takes a minute and helps you catch problems early.

Feeding an eartheater

OATA describes American cichlids as generally omnivorous, often preferring meaty foods. Eartheaters add their own feeding style: in the wild they sift sediment for invertebrates, plant material and detritus. Put together, the aim is a varied diet that reaches the sand, built around a good cichlid food and topped up with meaty extras.

A practical menu

• Main food: a specialised cichlid pellet or granule sized for the fish. Choose one that sinks, so it reaches the sand where an eartheater looks for food.
• Frozen or freeze-dried extras: OATA recommends supplementing pellets and granules with frozen or freeze-dried items. Smaller cichlids appreciate daphnia, brine shrimp and bloodworm, which suit a 4–8 cm fish.
• Larger foods later: larger cichlids prefer items such as cockles, lance fish or prawns, which become more appropriate as the fish grows.
• Variety: because wild eartheaters take plant material and detritus as well as invertebrates, a mix of foods makes more sense than a single product.

How much and how often

Feed once a day, offering only what the fish can eat within a few minutes. American cichlids can eat large amounts in one sitting, so it is easy to overfeed. Overfeeding leads to extra waste and uneaten food that breaks down and releases toxic waste into the water, undoing the work of your filter and water changes. If food is still lying on the sand after a few minutes, offer less next time.

An example week

One feed a day, sized so it is cleared within a few minutes, with the foods rotated through the week, might look like this:

Feeding alongside other fish

In a community aquarium, faster fish in mid-water can take food before it reaches the sand. Drop sinking food where the eartheater forages and watch that it actually eats rather than assuming it has. A fish that loses interest in food is one of the warning signs listed in the health section below.

Growing on from dispatch size

A fish bought at 4–8 cm will change a good deal as it grows, and the aquarium should be ready for that from the start rather than upgraded later. Three things change as it gets bigger:

• Food size. Smaller cichlids take daphnia, brine shrimp and bloodworm, while OATA lists cockles, lance fish and prawns for larger cichlids. Move up to larger pellets and foods as the fish grows.
• Waste. A bigger fish eating more produces more waste, so keep testing weekly and keep to the weekly water change.
• Its place among companions. A fish that starts out small beside its tank mates can become one of the largest fish in the aquarium, so recheck the mix as it grows.

How large it finally becomes depends on the species, which has not been identified. Treat the genus maximum of 28 cm in standard length as the upper bound for planning. American cichlids can live for several years in a well matured set-up with good water quality, so the aquarium you choose now is the one it is likely to live in for a long time.

Arrival and the first weeks

Before the fish is sent

Make sure the aquarium is ready: filter matured, temperature steady and a fresh test showing zero ammonia and zero nitrite. OATA advises checking that the aquarium is an appropriate size for the species before buying, and adding fish slowly, because the filter bacteria need to increase every time more fish are added and feeding increases.

How it travels

Everything is hand-packed by our team. Fish are bagged in pure oxygen and packed in an insulated poly box, with a heat pack when the weather calls for it, then carried by a tracked, licensed live-animal courier. We email the tracking number and your confirmed delivery date, so you know when to be in. The full terms are on our delivery and Live Arrival Guarantee page.

On the day it arrives

1. Be at the delivery address to receive the parcel; live fish cannot be left unattended.
2. Before opening anything, start one continuous unboxing video. Show the parcel still sealed with the outer box visible, keep filming while you open it, and finish with the fish still inside the sealed bag. This video is needed for any Live Arrival Guarantee claim.
3. Open and inspect the parcel on the same day it arrives.
4. Float the sealed bag in the aquarium for 20–30 minutes before releasing, so the fish is acclimatised slowly.
5. Release the fish without adding the bag water: never pour the bag water into your tank.
6. If anything has gone wrong, contact us the same day, with WhatsApp the fastest route, and send your order number and the unboxing video so we can arrange a replacement or refund.

The first weeks

Give the fish time to settle before judging it. Watch that it begins foraging on the sand and takes food, and look for the signs of a healthy fish that OATA lists: clear, bright eyes, undamaged fins, intact scales, no ulcers or bumps and normal swimming.

Keep testing through this period, because a new fish adds waste to the filter. If you plan to add more fish later, do it gradually rather than all at once, so the bacteria can keep pace. Overstocking or stocking too quickly is the route to the new tank syndrome described in the planning section.

Health checks and warning signs

All fish show slight variations in behaviour and appearance, but noticing a change early gives you time to act before it becomes a real health issue. OATA suggests keeping an eye on changes in the following:

• Swimming: hanging at the surface, sitting on the bottom or swimming erratically. For an eartheater, resting motionless on the bottom is different from normal foraging along it.
• Colour: turning darker or paler than normal.
• Temperament: more aggression, or more hiding, than usual.
• Breathing: gill covers moving faster or slower than normal.
• Appearance: white spots, fluffy growths, or loss of fins or scales.
• Condition: an increase or decrease in body weight.
• Feeding: eating less or losing interest in food.

If you notice any of these, test the water quality first. Ammonia, nitrite and nitrate readings show whether the aquarium itself may be the cause. Then contact us with your readings and a description of what you have seen, and we will help you decide what to do next.

Choosing companions

OATA is candid that mixing American cichlids can be difficult. The group varies in both size and temperament, and some species may be very aggressive. Calmer species can be mixed in a robust community aquarium with larger shoaling species, while the more aggressive species must be kept either alone or with equally aggressive cichlids. Because this eartheater has not been matched to a species, treat its temperament as something to watch rather than something to assume.

One fish or a pair

Most American cichlids do better either singly or in pairs, according to OATA, although a few species need a group. For this fish, a single eartheater or a pair in a large aquarium is the simplest plan. Some American cichlids show no obvious differences between the sexes unless they are breeding, so two young fish bought together are two fish of unknown sex rather than a planned pair.

Companions to consider and avoid

Questions to ask before adding a companion

• Does it want the same water, within 22–27°C and pH 6.5–8.0?
• Is it robust enough to share a tank with a cichlid that may grow large?
• Is it calm enough to leave a fish alone while it forages with its head down?
• Is the aquarium big enough for every fish at adult size, not just at purchase size?

How the space is shared

An eartheater spends much of its time on and just above the sand. Companions that live in mid-water and near the surface use a different part of the aquarium, which leaves the floor to the eartheater and eases competition at feeding time. A second species that also feeds from the sand means two fish working the same ground, so it needs more floor area and closer watching.

Introducing companions

Add fish gradually rather than all at once, so the filter can keep pace with the extra waste. Watch closely for several days after any addition, particularly at feeding time, when competition is most obvious. A fish that is chased away from the sand, hides more than usual or stops eating needs attention, and it helps to have a spare aquarium or another plan ready before you mix cichlids.

If you are planning a mix and are unsure how it will work, we are happy to talk it through with you before you order, using the size of your aquarium and the fish you already keep.

Questions keepers ask

How big does the Red Head Tapajos Eartheater get?

Its own adult size cannot be given with confidence, because the fish has not been matched to a species. It is sent at 4–8 cm, and the largest species in the genus Geophagus reach up to 28 cm in standard length, so plan the aquarium for a large fish.

What size aquarium does a Red Head Tapajos Eartheater need?

Plan for at least 300 litres with a wide floor of fine sand. OATA gives 300 litres for American cichlids over 15 cm and 120 litres for a pair of smaller species; with the species unknown and the genus including large fish, the larger figure is the safer plan.

How many Red Head Tapajos Eartheaters should I keep together?

OATA guidance for American cichlids is that most do better singly or in pairs, although a few species need a group. Start with one fish, or two in an aquarium large enough for both, and watch how they share the sand before adding more.

Is this eartheater suitable for a beginner?

Yes, if the aquarium is already large, filtered and mature. OATA describes American cichlids as usually undemanding, but this fish needs room to grow, open sand to forage and a weekly water change, and its exact species is unknown, so a steady routine matters most.

What does the Red Head Tapajos Eartheater eat?

It is an omnivore that often prefers meaty foods, and in the wild eartheaters sift sand for invertebrates, plant material and detritus. Feed a sinking cichlid pellet or granule, add frozen or freeze-dried daphnia, brine shrimp or bloodworm, and give only what it clears within a few minutes, once a day.

What temperature and pH does Geophagus sp. need?

OATA broad guidance for American cichlids is 22–27°C, pH 6.5–8.0 and a general hardness of 4–12°dH, with ammonia and nitrite at zero and nitrate no more than 20 mg per litre above tap water. Keep readings steady inside that range rather than chasing one exact figure.

Is the Red Head Tapajos Eartheater aggressive?

Temperament varies widely among American cichlids. Calmer kinds can share a robust community aquarium with larger shoaling fish, while more aggressive kinds must live alone or with equally aggressive cichlids. With the species unknown, introduce it carefully and watch its behaviour for the first weeks.

Which fish can live with a Red Head Tapajos Eartheater?

Larger shoaling fish in a robust community suit calmer American cichlids. Avoid highly aggressive cichlids, take care when mixing other American cichlids, and treat very small shrimp and snails on the sand as possible food rather than companions.

How does the Red Head Tapajos Eartheater arrive alive in the UK?

It is hand-bagged in pure oxygen, packed in an insulated poly box with a heat pack when the weather calls for it, and carried by a tracked, licensed live-animal courier. Someone must be in to receive it. Film one continuous unboxing video from the sealed parcel to the fish still in its bag, then float the bag for 20–30 minutes before releasing the fish.

Sources

These public sources underpin the identity, natural history and care guidance on this page.

• World Register of Marine Species: Geophagus – accepted genus and its place in the family Cichlidae.
• Wikipedia: Geophagus – distribution, habitats, the eartheater feeding habit and the size of the largest species.
• OATA: How to look after American cichlids – water, aquarium, feeding, maintenance, health and compatibility guidance for the group.
• RSPCA: fish environment – filtration and how ammonia, nitrite and nitrate are processed.
• Tropical Fish Co delivery and Live Arrival Guarantee terms – packing, courier and arrival steps, linked in the care tab.