Full Red Female Guppy (Poecilia reticulata)

Decide whether this guppy suits your aquarium

The Full Red Female Guppy (Poecilia reticulata) is a peaceful freshwater livebearer in the Poeciliidae family. Its native range covers Venezuela, Barbados, Trinidad, northern Brazil and the Guyanas. FishBase records females reaching 5 cm standard length, which measures the body without the tail fin. This social fish can suit a prepared beginner who has a mature, filtered aquarium and is ready to manage group behaviour, water quality and possible fry.

“Full Red” is a selected colour-form name rather than a separate species. The accepted scientific name remains Poecilia reticulata, as listed by Eschmeyer’s Catalog of Fishes. Plan for the needs of a guppy first: mineral-bearing neutral-to-alkaline water, open swimming room, cover, gentle flow and companionship.

Use these figures for the first decision

• Adult body length: 5 cm standard length for females.
• Aquarium plan: a mature, filtered aquarium at least 60 cm long for one small group.
• Social plan: 5 or more where the aquarium, sex plan and existing livestock allow.
• Routine water: the overlap of Tropical Fish Co, FishBase, Seriously Fish and OATA guidance is 22–28°C, pH 7.0–8.0 and 9–18 dGH.
• Temperament: peaceful, but vulnerable to persistent pursuit and fin-nipping tank mates.

Suits	Not suited to
A prepared beginner with a mature filtered aquarium	An uncycled bowl or unfiltered container
A planned social group with space and cover	Keeping one guppy alone
Neutral-to-alkaline, moderately hard or harder water	Long-term soft or acidic conditions
A quiet community screened for fin-nipping	Tiger barbs, serpae tetras or other fin-nipping fish

Read our complete Guppy Care Guide when planning the wider group, sex mix, water routine and response to fry.

Understand the female offer and dispatch size

The sold unit is one female Full Red Guppy, supplied at a dispatch size of 3–4 cm. That dispatch measurement describes the fish sent, not its final body length. Plan the aquarium around the recorded 5 cm adult standard length and allow for the tail fin beyond that body measurement.

Sex is guaranteed only when the exact product or selected option explicitly states male or female. This Full Red Female Guppy listing is sold as female.

A female-only group avoids new mating inside the group, but it does not rule out later fry. Female guppies may retain viable sperm after an earlier mating, so prepare a population plan even when adding only females. A rounded abdomen or dark belly area should not be treated as proof of pregnancy.

The gallery images are representative of this type of animal rather than photographs of the exact animal supplied, so colours can look slightly different from the live animal.

The gallery fish has a silvery body and broad yellow-and-black patterned fins rather than a full red appearance. The fish supplied is the Full Red colour form; the photograph shows guppy body shape only. Individual colour intensity, markings and fin appearance can vary.

Check the offer separately from the social plan

• Purchase unit: one female fish.
• Dispatch size: 3–4 cm.
• Adult planning size: 5 cm standard length.
• Recommended group: 5 or more where capacity and the sex plan allow.

Buying one fish does not by itself create the recommended group. Count the compatible guppies already present, assess the aquarium’s usable space and water tests, and add livestock gradually. Browse the guppy collection when comparing strains and stated sexes, but decide the final group from aquarium capacity rather than colour alone.

Plan a mature aquarium with usable length

Use a mature, filtered aquarium at least 60 cm long for one small guppy group. This is Tropical Fish Co’s conservative planning policy, based on FishBase’s 60 cm aquarium note and a group of 5 or more. Litres still matter for stability, but they do not show the usable swimming length, footprint, existing livestock or performance of the biological filter.

Seriously Fish gives a 45 × 30 cm base and approximately 41 litres for Poecilia reticulata. Our 60 cm length screen adds room for a social group, observation and intervention. An aquarium around 60 litres can be a candidate only if it is at least about 60 cm long, mature, filtered, suitably furnished and not already occupied. Five guppies are a conservative starting group under this policy, not an automatic maximum.

Build the layout around movement and retreat

• Keep an open horizontal swimming area instead of filling the whole footprint with decoration.
• Add live plants where practical, including some cover near the surface.
• Use smooth ornaments and artificial plants without sharp edges that could catch fins.
• Create sight breaks so a pursued fish can move out of another fish’s direct view.
• Avoid strong currents, and never let flow pin, exhaust or repeatedly displace the fish.
• Use a secure cover and make sure filter intakes cannot endanger small fish or fry.

Cover helps fish move away from social pressure, but dense planting also gives fry more places to survive. Add structure deliberately and retain enough open room to see whether every guppy can swim, feed and rest normally. If one individual remains cornered despite the layout, use a prepared separation aquarium rather than adding more decoration indefinitely.

Before bringing livestock home, follow our guide to preparing and maturing a first aquarium. A mature aquarium has an established biological filter that can process waste; elapsed time alone does not demonstrate that it is ready.

Keep water within the routine range

Keep this guppy at 22–28°C, pH 7.0–8.0 and 9–18 dGH. These values are the overlap of Tropical Fish Co’s routine guppy guidance, FishBase and Seriously Fish species ranges, and OATA’s group guidance.

Aim for steady conditions inside the range rather than repeatedly adjusting water to chase one exact reading. Test the aquarium water itself because tap-water chemistry differs by location and may change. Use our water chemistry guide to understand temperature, pH, hardness and nitrogen-cycle readings, then use the water matcher to compare measured aquarium water with the guppy range.

Use these water-quality limits

• Ammonia: 0 mg/L.
• Nitrite: 0 mg/L.
• Nitrate: no more than 20 mg/L above the normal tap-water level under OATA guidance.
• General hardness: 9–18 dGH for the working overlap.
• Temperature: verify 22–28°C with an independent aquarium thermometer.

Use a thermostatically controlled aquarium heater when the room cannot keep the water inside the range. Choose its output for the aquarium volume and room conditions, then confirm the result with a thermometer rather than relying only on the heater dial.

Guppies occur in fresh and brackish habitats, but that does not make aquarium salt a routine requirement. Do not add salt, minerals or pH-adjusting chemicals without measurements and a clear purpose. Any change must also suit the aquarium’s other animals, plants and biological filter.

Protect the biological filter and test weekly

Run a properly established filter continuously. The RSPCA explains that biological filtration supports bacteria that convert toxic ammonia to nitrite and then to safer nitrate. Guppies may be described as hardy, but they should never be used to cycle an aquarium.

Test ammonia and nitrite at least weekly and keep both at 0 mg/L. Record nitrate, pH and temperature at the same time so a gradual change is visible before the fish show distress. Test again after adding fish, increasing food, cleaning equipment or noticing altered swimming, breathing or appetite.

Follow a repeatable weekly routine

1. Test the aquarium before disturbing it and note the readings.
2. Change 25% of the water at least once a week.
3. Treat replacement tap water with a suitable conditioner before it enters the aquarium.
4. Use a siphon to remove settled solid waste without stripping every surface clean.
5. Check the filter intake and flow for blockages.
6. Inspect the heater and thermometer for agreement.
7. Observe each guppy after maintenance for steady swimming and regular breathing.

When filter media needs cleaning, rinse it lightly in aquarium water removed during the water change, never under the tap.

Fish numbers, feeding and waste production affect the filter together. Add animals slowly so the bacterial population can respond to the increased load. If ammonia or nitrite becomes detectable, stop further additions, check the filter and feeding routine, and restore safe water quality before reconsidering the stocking plan.

A larger aquarium can make temperature and water chemistry more stable, but volume does not remove the need for weekly testing and partial changes. The same nominal aquarium can perform very differently depending on stocking, filter maturity, maintenance and source water.

Feed a complete omnivore staple once daily

Use an appropriately sized, nutritionally complete omnivore flake or granule as the staple. FishBase records guppies feeding on zooplankton, small insects and detritus, and Seriously Fish notes that tank-bred fish will accept most foods offered. Add safe compatible algal and invertebrate variety rather than relying on one treat food.

OATA’s guppy-and-molly guidance says guppies should only be fed what they can eat within a few minutes, once a day. Start with a small measured portion. Watch the whole group, then adjust the next portion if food reaches the bottom, enters the filter or remains after the fish stop feeding.

Build variety around the complete food

• Use complete flake or small granules sized for the guppy’s mouth.
• Offer small live or frozen foods such as daphnia, small bloodworm or tubifex as compatible variety.
• Include suitable algal ingredients as part of an omnivore diet.
• Distribute food so quieter fish can reach it without entering persistent pursuit.
• Remove uneaten food before it breaks down and increases waste.

Check feeding response rather than judging only by how quickly the boldest fish eat. A fish repeatedly excluded from food needs intervention through distribution, layout or safe separation. Adding more food to compensate can worsen water quality while still failing to reach the excluded individual.

Match particle size to the fish. Food that is too large may be ignored or broken into waste, while fine food can disappear into the filter before it is eaten. Fry require food sized for their mouths and closer water-quality monitoring, but an unexpected brood should not lead to uncontrolled heavy feeding.

Reduced appetite is a warning sign when it differs from the fish’s usual pattern. Check behaviour, breathing, social pressure and water readings before changing foods repeatedly. Do not use extra feeding to address weight loss until water quality and access to food have been assessed.

Build a social group with a population plan

Plan for 5 or more guppies where aquarium capacity, filtration, water tests and the sex plan allow. FishBase gives a group of 5 or more, while OATA advises at least 3 and suggests two females for each male in mixed groups. Tropical Fish Co uses the more conservative group of 5 or more for routine planning.

This purchase adds one stated female to that plan. Count the guppies already in the aquarium rather than treating the sold unit as a complete group. Additions should be gradual, and every fish must be able to feed and move away from pursuit.

Choose the group arrangement before adding fish

Group plan	Decision to prepare for
Female-only	No new mating within the group, but stored sperm may still result in fry
Mixed sex	Courtship, possible fry and space for more females than males
Existing group	Whether one more fish changes chasing, feeding access or filter load
New group	A mature 60 cm aquarium, gradual stocking and a ready separation option

Female guppies can produce young after a male is no longer present because viable sperm may be retained following earlier mating. Before purchase, decide where unexpected fry could be housed and how they would be responsibly rehomed. Do not rely on adult fish or tank mates eating fry as a population-control plan.

Watch for repeated pursuit, cornering, hiding, missed feeding, weight loss or damaged fins. Peaceful describes the species’ general temperament; it does not make every social interaction harmless. A ratio can reduce pressure in some mixed groups, but it cannot guarantee that a particular individual will be left alone.

Keep a mature separation aquarium ready where possible. It should have biologically supported filtration, suitable water and enough room for the fish to behave normally. A small uncycled container is not a safe response to chasing, illness or fry.

Follow the store arrival steps

Prepare and test the mature aquarium before the fish travels, and arrange for someone to receive the parcel because live fish must not be left unattended. Our delivery and Live Arrival Guarantee policy explains the packing, reporting terms and arrival procedure. The fish is hand-bagged in pure oxygen and placed in an insulated box, with a heat pack used when weather conditions call for it.

Use this arrival sequence

1. Start filming before the parcel is opened. Show the parcel still sealed with the outer box visible, open it in one continuous take on the day it arrives, and show the fish still inside the sealed bag.
2. Float the bag in the prepared aquarium for 20–30 minutes before releasing the fish.
3. Release the fish without pouring the transport water into the aquarium.

OATA advises checking that ammonia and nitrite are both 0 mg/L before adding fish. Confirm that the aquarium temperature, pH and hardness match the working range before arrival. Arrival day is not the time to complete cycling, make a large chemistry adjustment or add several unplanned animals.

Use the first week to confirm the plan

OATA advises watching swimming, colour, temperament, breathing, physical condition and feeding. Establish the fish’s normal pattern, then respond to changes rather than assuming every unusual sign is part of settling in.

• Swimming: look for steady movement rather than hanging at the surface, sitting on the bottom or moving erratically.
• Breathing: watch for a clear increase or decrease in gill-cover movement.
• Fins and skin: check for open, undamaged fins, intact scales and no new spots, growths or wounds.
• Feeding: confirm that the female reaches food without being chased away.
• Social behaviour: intervene if hiding, cornering or pursuit becomes persistent.

If a change appears, test the water immediately and compare the result with the pre-arrival readings. Check equipment, recent maintenance and social behaviour before selecting any response.

Track growth and respond to health changes

Plan for 5 cm standard length, the female size recorded by FishBase. Standard length excludes the tail fin, so the fish’s total visible length may be greater. Growth continues after dispatch, so plan space and companions for the full adult body length rather than the 3–4 cm size supplied.

Do not judge growth or health from length alone. A settled guppy should swim steadily, breathe regularly, hold its fins open, maintain a normal body profile and feed consistently. Compare the fish with its own established pattern because sudden change is more useful than colour intensity by itself.

Act on warning signs promptly

The RSPCA’s fish health guidance treats hiding, clamped fins, surface gasping, loss of balance, spots, wounds and sudden appetite change as reasons to investigate. Test ammonia, nitrite, nitrate, pH and temperature immediately. Inspect the filter, heater, recent maintenance, food, new arrivals and interactions within the group.

A symptom is not a diagnosis. Do not choose salt, extra heat or medication from one sign alone. Isolate safely where appropriate, record changes with dates or photographs and seek a qualified diagnosis. OATA maintains a UK fish-vet directory for professional help.

Use a separate quarantine system

The MSD Veterinary Manual recommends at least 30 days of quarantine, with longer isolation where indicated. Use dedicated equipment, biologically supported filtration, stable suitable water and regular testing. Quarantine is observation and biosecurity, not automatic medication.

Keep nets and maintenance equipment separate between systems. If shared equipment must move between aquariums, clean and manage it in a way that prevents water and pathogens moving with it. Continue to monitor the main group because a new health change may reflect water quality or social pressure rather than an isolated problem.

Screen every community fish before mixing

Choose quiet community fish whose adult needs overlap with the guppy’s working range. The overlap of Tropical Fish Co, FishBase, Seriously Fish and OATA guidance is 22–28°C, pH 7.0–8.0 and 9–18 dGH. Seriously Fish describes guppies as very peaceful and says they do well in a quiet community tank with other livebearers, rasboras, corydoras, small loricariids and tetras. These are kinds to screen, not universal promises.

Check six points before adding a tank mate

1. Water: use a comfortable overlap in temperature, pH and hardness rather than placing either species at the edge of its range.
2. Adult size: rule out animals large enough to swallow or seriously injure the guppy.
3. Fins and temperament: check for fin-nipping, territorial defence, persistent display and courtship pressure.
4. Social space: include the full group requirement of both species when assessing the footprint.
5. Feeding: confirm that every animal can reach suitable food without being displaced.
6. Separation: have a mature alternative ready if behaviour changes after introduction.

Avoid fin-nipping species such as tiger barbs and serpae tetras. OATA also advises against fish likely to nip guppy fins. Long or broad fins can attract repeated attention, and fin damage can occur even when the aquarium’s water values overlap.

Other livebearers, rasboras, corydoras, small loricariids and suitable tetras may work in a quiet community after exact species-level checks. Adult size, group requirements and usable bottom or swimming space still matter. A corydoras group, for example, needs its own floor area rather than sharing an assumed fish-per-litre allowance.

Observe the result after introduction. Repeated pursuit, hiding, missed feeding, rapid breathing or damaged fins means the combination needs intervention. Do not add another fish to distract an aggressor unless the revised social and space plan independently supports that addition.

Manage livebearers, invertebrates and uncertain mixes

Treat every mixed aquarium as a conditional match. Some platies, mollies or corydoras may pass the water, space and behaviour screen, but the exact species and adult needs decide the result. Bettas are not a sensible default companion because territorial display and long-fin interactions vary between individuals.

Do not promise compatibility with “invertebrates” as one category. Adult size, mobility and refuge needs vary widely. Small shrimp or young may be eaten, so assess the exact species and provide a separation plan instead of assuming planting guarantees safety.

Keep species identity clear around Endler’s livebearers

Endler’s livebearer is Poecilia wingei, a separately described species. The formal description of Poecilia wingei distinguishes it from P. reticulata, and Eschmeyer’s Catalog of Fishes lists the name as valid. The two species can hybridise, so keep documented lines apart.

Mixed guppy sexes require a fry plan, while a female-only arrangement may still produce young after earlier mating. Adding another livebearer species also increases competition for swimming space and food. Count each species’ whole social group and allow for possible population growth before deciding that the aquarium has capacity.

Use observed behaviour to make the final decision

• If every fish feeds, swims normally and can retreat without being cornered, continue close observation.
• If one fish hides continuously or misses food, change the layout or separate it safely.
• If fins become damaged, remove the source of persistent nipping rather than waiting for acclimatisation to solve it.
• If fry appear, protect water quality and use the population plan prepared before purchase.
• If the aquarium cannot hold both complete social groups, choose one group rather than reducing each below its recommended number.

Compatibility remains conditional because individual behaviour, aquarium dimensions and existing livestock affect the outcome. The practical standard is not whether two names appear on a tank-mate list, but whether both animals can meet their full care needs in the same aquarium.

Answer the main questions before choosing

How big does a Full Red Female Guppy get?

A female reaches 5 cm standard length according to FishBase; standard length excludes the tail fin, so allow additional room for the visible tail.

What size aquarium does a Full Red Female Guppy need?

Use a mature, filtered aquarium at least 60 cm long for one small group. Tropical Fish Co applies this conservative screen alongside adult size, sex mix, tank mates, filtration and water-test results.

How many Full Red Female Guppies should live together?

Plan for 5 or more guppies where aquarium capacity and the sex plan allow. FishBase gives a group of 5 or more, while OATA’s group guidance advises at least 3.

Is Poecilia reticulata suitable for beginners?

It can suit a prepared beginner, but it needs a mature filtered aquarium, 0 mg/L ammonia and nitrite, stable mineral-bearing water, a planned social group and a response plan for chasing or fry.

What does this guppy eat?

Feed an appropriately sized complete omnivore flake or granule as the staple, with safe algal and invertebrate variety. OATA says guppies should only be fed what they can eat within a few minutes, once a day.

What temperature and pH does a Full Red Female Guppy need?

Keep it at 22–28°C and pH 7.0–8.0, with hardness of 9–18 dGH. These values are the overlap of Tropical Fish Co’s routine guidance, FishBase and Seriously Fish species ranges, and OATA’s guppy-and-molly guidance.

Is this female guppy aggressive or likely to nip fins?

It is generally peaceful, but social pursuit still needs monitoring. Avoid fin-nipping fish such as tiger barbs and serpae tetras because they may damage guppy fins.

Which kinds of animals can this guppy live with?

Other livebearers, rasboras, corydoras, small loricariids and suitable tetras may work after checking water overlap, adult size, group space, feeding competition and fin-nipping risk; small shrimp or young may be eaten.

How does a Full Red Female Guppy arrive alive in the UK?

It travels hand-bagged in pure oxygen inside an insulated box, with a heat pack when weather calls for it. Film every delivery in one continuous take from the sealed parcel to the fish still in its bag, opening it on the day it arrives, with someone there to receive the parcel; then float the bag for 20–30 minutes before release and do not pour transport water into the aquarium.

Check the identity, care and welfare references

• FishBase: Poecilia reticulata — identity, family, native range, environmental values, recorded size, wild diet and aquarium notes.
• Seriously Fish: Poecilia reticulata — aquarium footprint, water range, maintenance, diet, behaviour and named community companions.
• OATA: How to look after guppies and mollies — group care, feeding, maintenance, social planning and warning signs.
• RSPCA: Aquarium environment — filtration and the biological processing of fish waste.
• RSPCA: Fish health and welfare — health observations and water-quality checks.
• Eschmeyer’s Catalog of Fishes: Poecilia reticulata — accepted scientific name and type locality.
• MSD Veterinary Manual: Management of aquarium fish — quarantine and water-quality-led investigation.
• OATA fish-vet directory — UK directory for qualified diagnosis and treatment.
• Description of Poecilia wingei — formal description distinguishing Endler’s livebearer.
• Eschmeyer’s Catalog of Fishes: Poecilia wingei — current valid-name record.