Gold Chinese Algae Eater (Gyrinocheilus aymonieri)

Gold Chinese Algae Eater is the golden domestic form of Gyrinocheilus aymonieri, a large Southeast Asian river fish also known as the Chinese Algae Eater, Sucking Loach or Honey Sucker. Its bright yellow-gold body and sucker-like mouth make it distinctive, but the name can create the wrong expectation: this is not a small cleaner fish for every community aquarium. Juveniles graze algae and biofilm actively; adults can reach about 28 cm, become territorial and need substantial swimming room, oxygenated water and carefully chosen companions.

Each quantity is one unsexed fish in the approximate live size selected. The 4-5 cm and 6-7 cm choices describe dispatch size, not adult size and not different care requirements. Sex, a compatible pair, a particular shade of gold and the individual shown in the gallery are not guaranteed. Current size availability and price come from the live selector beside this guide.

This fish suits an experienced or well-prepared keeper who wants a bold, active river grazer and can plan for its adult behaviour. It is a poor fit for nano aquariums, peaceful long-finned communities or anyone expecting algae alone to provide a complete diet. The algae-eater collection includes gentler alternatives when this species is too large or assertive.

Gold Chinese Algae Eater care summary

Accepted species	Gyrinocheilus aymonieri (Tirant, 1883)
Family	Gyrinocheilidae
Domestic form	Golden or yellow colour form
Other common names	Chinese Algae Eater, Sucking Loach, Honey Sucker
Adult planning size	Up to about 28 cm standard length
Practical adult aquarium	About 200 litres and 120 cm usable length for one; around 300 litres or more for a robust community
Temperature	24-28°C; 25-28°C matches the core species range
pH and hardness	pH 6.0-8.0; approximately 5-19 dGH
Temperament	Active, solitary and increasingly territorial with age
Diet	Algae and biofilm plus prepared plant-based food and measured invertebrate or omnivore variety
Care level	Intermediate

Read the Size Selector as Arrival Size

The listed 4-5 cm and 6-7 cm options are juvenile sizes. Both can grow into the same large adult species, so neither belongs in a small aquarium as a permanent home. A 4-5 cm fish may look suitable beside small tetras today, yet its adult mouth, body mass, territory and activity will be very different. Choose the fish only if the adult aquarium is already available or firmly planned.

What the two live size options mean

Listed size	Life stage	Immediate planning point
4-5 cm	Small juvenile	Needs dependable feeding access, mature surfaces and protection from large predatory tank mates
6-7 cm	Larger juvenile	May establish a territory sooner and should enter an aquarium with adult-scale space and robust companions

Live fish do not measure like manufactured items, so each band is approximate. Fin position, body curve and normal individual variation affect the measurement. Ordering two does not create a pair and can create conflict as the fish mature. For most home aquariums, one individual is the safer plan.

What This Fish Is, and What It Is Not

Gyrinocheilus aymonieri belongs to Gyrinocheilidae within the order Cypriniformes. Although Sucking Loach is a common trade name, it is not a true loach. It is also not a catfish, pleco or Siamese Algae Eater. Those names describe different families and different behaviour. Clear identity matters because advice written for a bristlenose pleco, Otocinclus or Crossocheilus should not be transferred automatically to this fish.

The gold form is a colour variety of the same species, not a separate species or subspecies. It should therefore be planned around the same adult size, river adaptation and territorial potential as the normally patterned form. The gallery represents the golden appearance, but colour can range from pale lemon through warm honey gold. Lighting, background, age, diet and stress can all change how intense the colour looks.

Adult Size and Aquarium Footprint

FishBase records a maximum of 28 cm standard length. Standard length stops at the base of the tail, so the complete fish can occupy slightly more horizontal space. A practical adult home for one should start around 200 litres with at least 120 cm of usable length, a broad footprint and uninterrupted turning room. A mixed community benefits from about 300 litres or more because the other fish need somewhere to avoid the grazer's preferred surfaces and territory.

Volume alone is not enough. A tall, narrow aquarium may hold many litres while offering little floor area or distance between resting places. Prioritise length, width, broken sightlines and several feeding zones. Use the aquarium care planner with the internal dimensions after substrate and decor are installed, not only the manufacturer's nominal volume.

Adult-space checklist

Feature	Practical target	Reason
Usable length	About 120 cm or more	Allows sustained movement and separation from tank mates
Footprint	Broad rather than narrow	Creates more grazing surfaces, retreats and alternative routes
Single-fish volume	About 200 litres as a starting point	Supports the adult body mass and stable filtration
Community volume	About 300 litres or more	Reduces forced contact with robust mid-water companions
Hardscape	Several smooth areas divided by wood or plants	Breaks sightlines and avoids one contested resting point
Contingency	Cycled divider or separate aquarium	Provides a humane response if persistent harassment develops

River Adaptations and Why Flow Matters

Wild G. aymonieri occurs in medium and large rivers, flooded areas and flowing water across the Mekong, Chao Phraya and Meklong systems and the northern Malay Peninsula. Its inferior mouth forms a specialised oral sucker. Anatomical work describes flexible lip tissues and rows of small keratinised hooks that help the fish attach and scrape encrusting growth. Separate openings near the gill covers allow water movement for respiration while the mouth is attached.

The aquarium does not need to be a high-speed torrent from end to end, but it should provide clean, well-oxygenated water and a definite current. Aim a filter return along the length of the aquarium, leave calmer retreats behind wood and keep the surface moving. Watch the fish rather than relying on the pump label: normal attachment and active grazing are different from continually struggling against a jet.

Water Parameters and Stability

A dependable home range is 24-28°C, pH 6.0-8.0 and approximately 5-19 dGH. FishBase gives 25-28°C for the species, while established aquarium references show that acclimated fish can tolerate a broader temperature window. For mixed tropical housing, stability within the central range is safer than repeatedly moving between extremes.

Practical water targets

Temperature	24-28°C, stable; 25-28°C is the core species range
pH	6.0-8.0, with sudden changes avoided
General hardness	Approximately 5-19 dGH
Ammonia	0 mg/L
Nitrite	0 mg/L
Nitrate	Keep controlled through stocking, feeding and regular partial changes
Oxygen	High, supported by surface movement and distributed flow

Test the source water before buying. The water matcher can organise your readings, but it cannot replace a liquid test kit or a repeatable maintenance routine. If tap water sits near one edge of the range, stable acclimation is usually safer than abrupt chemical correction.

Filtration and Maintenance

Use a mature biological filter sized for the adult fish and the complete community. Large adults are active and produce considerably more waste than the juvenile in the selector. Provide enough flow to move waste toward the intake without pinning fish against the glass. A pre-filter sponge can protect fins and retain grazing life, but it still needs regular cleaning.

Test ammonia, nitrite, nitrate, pH and temperature at least weekly, and more often after adding fish or changing filtration. Ammonia and nitrite must remain at zero. Replace an appropriate portion of water with dechlorinated, temperature-matched water, remove trapped waste and rinse biological media in removed aquarium water. Clear water is not proof of safe chemistry.

Aquascape for Grazing and Territory

Use rounded cobbles, smooth rock, sturdy wood and open glass areas to create varied grazing surfaces. Avoid sharp stone edges around the belly and mouth. Divide the lower zone into several visual sections rather than building one cave that every bottom fish must share. Leave an open lane through the aquarium so an adult can turn without scraping decor.

Hardy attached plants such as Anubias, Java fern and Bolbitis are practical because they tolerate current and do not need to be rooted where the fish grazes. Robust rooted plants can also work behind protective stones. Delicate leaves may be damaged by persistent grazing or normal movement. Floating cover can soften bright light without blocking all surface agitation.

Feeding: Algae Is Only Part of the Diet

In nature, the species feeds largely on algae, periphyton and phytoplankton, with insect larvae and zooplankton also recorded. Periphyton is the mixed film of algae, microbes and tiny organisms growing on submerged surfaces. That is much more nutritionally complex than a patch of green glass. A home aquarium, especially a clean new one, cannot be assumed to produce enough food.

Use a quality algae wafer or sinking plant-based food as the prepared foundation. Add spirulina-rich granules, blanched courgette, spinach or shelled pea, then measured frozen or live foods such as daphnia, brine shrimp or mosquito larvae. Offer food where the fish can feed without defending one narrow corner. Remove uneaten vegetables before they foul the water.

Balanced feeding plan

Food	Role	Control point
Algae wafer or sinking herbivore granule	Prepared daily foundation	Choose a portion consumed without leaving soft waste overnight
Spirulina-rich food	Plant and algae-based variety	Rotate rather than relying on one product
Courgette, spinach or shelled pea	Fresh vegetable enrichment	Blanch if needed and remove uneaten pieces
Daphnia, brine shrimp or mosquito larvae	Measured animal-food variety	Use small portions, not a protein-only diet
Naturally grown biofilm	Grazing behaviour and dietary diversity	Useful enrichment, never proof that no prepared food is needed

What It Can and Cannot Do About Algae

A young Chinese Algae Eater may clear soft algae and biofilm quickly, but it cannot correct the cause of an algae problem. Excess light, nutrient imbalance, overfeeding, weak plant growth and delayed maintenance still require direct action. Adults often spend less time grazing algae than juveniles and take a broader diet.

Algae-control expectations

Expectation	Realistic answer
Will it clean every surface?	No. Grazing varies with age, food, surface and individual behaviour.
Can it live on tank algae?	No. Provide complete prepared food and dietary variety.
Will it solve green water or cyanobacteria?	No. Those problems need correct diagnosis and husbandry.
Can I add several for faster cleaning?	Not safely in an ordinary home aquarium; adults can be strongly territorial.
Does extra feeding remove aggression?	No. Good nutrition matters, but it does not erase adult territorial behaviour.

Behaviour Changes with Age

Juveniles are often busy, visible grazers that move between glass, wood and stone. As the fish matures, it may claim a cave, rock face or section of the lower aquarium and chase similar-looking fish away. Brief displacement is different from persistent harassment. Act when another fish is trapped, loses feeding access, develops wounds, hides continually or shows rapid breathing and clamped fins.

Do not depend on decor alone to solve an incompatible combination. More wood can reduce direct sightlines, but it cannot make a slow long-finned fish able to withstand repeated pursuit. A divider or separate mature aquarium is the correct response when welfare is compromised.

Gold Chinese Algae Eater Tank Mates

Choose companions by adult behaviour, body shape, speed, feeding access and water requirements. Robust, active mid-water fish are safer candidates than slow, flat-bodied or long-finned species. Larger danios, sturdy barbs and selected rainbowfish may work in a spacious aquarium when their own social-group needs are met.

Avoid angelfish, discus, bettas, fancy goldfish, slow gouramis and other fish that present a broad body or trailing fins. Similar bottom fish can also trigger territory disputes. The tank-mate tool is a useful first filter, but observed behaviour and adult space decide the final answer.

Compatibility decision guide

Candidate	Assessment	Conditions
Larger danios	Often possible	Proper group, strong swimming space and matching warm water
Sturdy barbs	Possible with care	Avoid fin-nipping species and provide a large footprint
Selected rainbowfish	Often possible	Robust adults, correct group and adequate open water
Another Chinese Algae Eater	High-risk specialist setup	Do not keep a casual pair; ordinary aquariums should house one
Angelfish, discus or fancy goldfish	Unsuitable	Slow, broad-bodied fish are vulnerable to attachment and damage
Bettas and long-finned gouramis	Unsuitable	Too slow and too easily stressed or injured
Similar bottom grazers	Often risky	Competition and territory overlap can become persistent
Tiny fish and ornamental shrimp	Not a dependable match	Size, feeding competition and individual behaviour make outcomes uncertain

One Fish, Not a Casual Pair

For a normal home aquarium, keep one. Adult Chinese Algae Eaters can be territorial toward their own kind and similar-shaped bottom fish. A random pair does not gain the security of a shoal; one fish may dominate the other continuously. Specialist group keeping requires a genuinely large aquarium, numerous territories and close observation, not simply two or three fish added together.

If you are comparing personalities and adult requirements, the Siamese Algae Eater is a different species with a different social profile. The Golden Black Chinese Algae Eater and Black Gold Chinese Algae Eater are closer comparisons, but colour does not remove the adult territorial risk.

Health, Body Condition and Warning Signs

A healthy fish should attach confidently, move purposefully between surfaces, breathe steadily and maintain a smooth body profile. A slightly rounded abdomen after feeding is normal; a pinched belly can indicate inadequate intake or disease. Check for clear eyes, intact mouth tissue, complete fins and no red sores where the body contacts hardscape.

Behaviour and health observations

Observation	Possible meaning	First check
Rapid breathing	Low oxygen, ammonia, nitrite, temperature stress or disease	Test water and increase safe aeration
Constant hiding with a pinched belly	Feeding exclusion, stress or internal illness	Observe feeding and social pressure
Repeated chasing	Territory conflict	Check the victim's escape and feeding access
Mouth redness or abrasion	Rough decor, collision or infection	Inspect surfaces and water quality
White spots or clamped fins	Parasites, stress or infection	Quarantine and diagnose before treatment

Do not medicate from one symptom alone. Correct water quality, oxygen, feeding and compatibility problems while identifying the cause. Where possible, quarantine new fish in a mature separate system before introducing them to established stock.

Acclimation and the First Week

Prepare the aquarium before delivery: mature filter, stable temperature, dim lighting, smooth cover and a secure lid. Follow the fish acclimation guide and use the acclimation timer to keep the process measured. Do not prolong an opened shipping bag unnecessarily, because its water chemistry changes once exposed to air.

After release, keep lights low and avoid a large meal immediately. Offer a small sinking food once the fish is settled, then confirm that it eats without being chased. Test ammonia and nitrite during the first week, inspect the mouth and belly daily, and watch all tank mates for changes in breathing, hiding and feeding.

Sexing and Breeding

Sexing juveniles is not dependable. Mature males have been reported with breeding tubercles around the head, but that is not a reliable retail-sexing method for the sizes offered here. Each fish is therefore sold as unsexed.

Breeding behaviour is poorly documented in ordinary home aquariums and commercial production should not be confused with a straightforward hobby method. Do not buy two expecting a male-female pair. The immediate welfare priorities are adult space, stable water, complete feeding and management of territorial behaviour.

Compare Similar Bottom-Zone Fish

Common names make these fish easy to confuse. The comparison below is a decision aid, not permission to combine all four in one aquarium. Follow each linked listing's adult care requirements.

Chinese Algae Eater and alternative bottom-zone fish

Fish	Key difference	Best reason to compare
Gold Chinese Algae Eater	Large solitary river grazer with adult territorial risk	For a spacious aquarium with robust companions
Siamese Algae Eater	Different genus and social behaviour	When comparing algae grazers rather than colour forms
Albino Rainbow Shark	Territorial cyprinid with a different mouth and feeding profile	For keepers comparing assertive feature fish
Kuhli Loach	Small social nocturnal true loach	For a peaceful group in a suitable soft-substrate aquarium
Clown Loach	Very large social true loach with group requirements	For advanced keepers planning a large shoal aquarium

Is This the Right Fish for Your Aquarium?

This is a suitable choice when the aquarium is mature, at least around 120 cm long, strongly filtered, well oxygenated and stocked with robust compatible fish. It is not suitable when the plan depends on permanent algae removal, a small tank, a gentle mixed bottom community or a pair bought without specialist group space.

Pre-order fit check

Adult aquarium ready	About 200 litres and 120 cm length for one, larger for a community
Water suitable	Stable 24-28°C, pH 6.0-8.0 and approximately 5-19 dGH
Flow and oxygen	Distributed current, surface movement and calmer retreats
Tank mates screened	No slow, broad-bodied or long-finned vulnerable fish
Diet planned	Prepared plant-based food, vegetables and measured animal-food variety
Separation possible	Divider or mature alternative home available if aggression persists

Evidence Behind the Care Guidance

The accepted identity, 28 cm maximum standard length, river distribution, 25-28°C core range and natural feeding ecology are supported by the FishBase species account. The oral-sucker explanation is supported by peer-reviewed anatomical research. Water-testing and mature-filter guidance follows OATA freshwater aquarium guidance.

Published biological information does not answer every aquarium question. The 200-litre and 120 cm recommendation is a practical adult-welfare starting point derived from the documented body size, active river habitat and territorial behaviour, not a claim that every aquarium at that number will be suitable. Stocking density, footprint, filtration, decor and companion species can require more space.

Ordering and Live-Fish Delivery

Choose the live size option and quantity beside this guide. Eligible first orders can use WELCOME10 for 10% off under the current promotion and checkout terms. Before ordering, read the live-fish buying guide and confirm that someone can receive the delivery promptly.

Qualifying livestock arrivals are protected by the Live Arrival Guarantee when the current delivery, receiving, contact-time and evidence conditions are followed. Check UK livestock delivery and the Live Arrival Guarantee terms before checkout. The five preserved gallery images are representative and remain in their existing order; they do not promise the exact fish dispatched.

Gold Chinese Algae Eater FAQ

What species is the Gold Chinese Algae Eater?

It is the golden domestic form of Gyrinocheilus aymonieri, a member of the family Gyrinocheilidae.

Is the gold form a separate species?

No. Golden colour does not change the species, adult size, river adaptation or territorial potential.

Is a Sucking Loach a true loach?

No. Sucking Loach is a common name. This fish is not a true loach, catfish, pleco or Siamese Algae Eater.

How large does a Chinese Algae Eater grow?

Plan for up to about 28 cm standard length, with the tail adding to the full visual length.

What aquarium size does one adult need?

Start around 200 litres and 120 cm of usable length for one. A robust mixed community should have around 300 litres or more, with a broad footprint and separated territories.

What temperature and pH are suitable?

Use a stable 24-28°C and pH 6.0-8.0. Approximately 5-19 dGH is a useful hardness range.

Are Gold Chinese Algae Eaters aggressive?

Juveniles may appear peaceful, but adults commonly become territorial and can harass similar, slow or long-finned fish.

What are suitable tank mates?

Robust active mid-water fish such as larger danios, selected sturdy barbs and suitable rainbowfish can work in a spacious aquarium when their own group needs are met.

Can one live with angelfish or discus?

No dependable safe match can be promised. Their slow movement and broad sides make them vulnerable to attachment, chasing and injury.

Should I keep one or a group?

Keep one in most home aquariums. A casual pair or trio can concentrate aggression; specialist group keeping needs a genuinely large system and close supervision.

Will it eat all the algae?

No. Juveniles often graze actively, but adults may graze less. Lighting, nutrients and maintenance still need direct control.

Can it live only on algae in the aquarium?

No. Feed prepared plant-based foods, vegetables and measured invertebrate or omnivore variety.

Will it damage plants?

Hardy attached plants usually fit better than delicate soft leaves. Normal grazing and adult movement can damage fragile growth.

Is it safe with ornamental shrimp?

There is no dependable shrimp-safety guarantee. Adult size, territorial behaviour and feeding competition make the combination uncertain.

How can I tell male from female?

Juveniles cannot be sexed reliably from ordinary retail appearance. Each fish is sold unsexed.

Does ordering two guarantee a pair?

No. Sex and compatibility are not guaranteed, and two maturing fish may become strongly territorial toward each other.

How long does a Gold Chinese Algae Eater live?

An exact lifespan cannot be promised from the evidence used here. Treat it as a long-term, multi-year commitment and plan for the adult fish from the start.

Will the selected 4-5 cm or 6-7 cm size stay that small?

No. Both are juvenile dispatch sizes for a species that can reach about 28 cm standard length.

Will my fish look exactly like the gallery?

No. The images are representative. Shade, markings, body shape and size vary, and the dispatched fish is not the exact individual shown.

Do WELCOME10 and the Live Arrival Guarantee apply?

WELCOME10 gives 10% off eligible first orders under the current promotion. The Live Arrival Guarantee applies to qualifying livestock orders when the current delivery and claim conditions are followed.