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Topaz Cichlid (Amatitlania myrnae) in a planted aquarium — representative image

Amatitlania myrnae

Topaz Cichlid (Amatitlania myrnae)

Moderate Care
Territorial
15% Special OfferEnds Wed 31 Mar
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Topaz Cichlid (Amatitlania myrnae) for structured Central American aquariums; a compact territorial cichlid with cave, feeding and tank-mate guidance.

Amatitlania myrnaeCentral American CichlidCichlidsCryptoheros myrnaedeal-run-20260422-180310Freshwater FishModerate CareTerritorial Pair

Care at a Glance

Scientific Name
Amatitlania myrnae
Care Level
Moderate
Temperament
Territorial Central American cichlid, especially around caves and breeding sites
Temperature
23–27°C
Diet
Omnivore: cichlid pellets, small frozen foods and vegetable/spirulina foods
Source-labelled Bolivian ram swimming above aquarium gravel
Full Care Guide

Cichlids: Types, Care & Tank Planning

Cichlids are a family of roughly 1,800 accepted species, not one care type. Before buying, identify the exact species and source, then compare adult measurement, usable tank dimensions, social system, territory, tested water, diet and an exit plan. No family-wide minimum tank, water range or tank-mate list is safe.

14 min readRead guide

Water Parameters

Maintain these water conditions for optimal health and vibrant colors

Temperature
23–27°C
23°CIdeal27°C

Topaz Cichlid (Amatitlania myrnae) is a compact Central American cichlid for aquarists who enjoy personality, structure and breeding behaviour in a manageable aquarium size. It is also seen under the older name Cryptoheros myrnae, so both names are useful when comparing care notes.

This is not a delicate soft-water community fish. It is a small but territorial cichlid from clear, mineral-rich streams and rivers, best kept in a mature aquarium with rockwork, wood, open sand and robust tank mates.

Quick Facts

Common name Topaz Cichlid
Scientific name Amatitlania myrnae, also traded as Cryptoheros myrnae
Adult size Usually up to around 8-10 cm, depending on sex and line
Care level Moderate; easy to feed, but territorial when settled
Temperament Territorial cichlid, especially around caves and breeding sites
Diet Omnivore with a varied pellet, frozen and vegetable-based diet
Best for Structured Central American or robust community cichlid aquariums

Why Choose Topaz Cichlids?

Topaz Cichlids are attractive because they give the keeper classic Central American cichlid behaviour without the size of many larger species. They inspect caves, defend chosen areas, sift around the bottom and become much more interesting once they feel settled. Females can show especially strong colour and display behaviour during breeding condition.

The species is relatively uncommon in everyday aquarium shops, so it is worth keeping the page clear and useful rather than padding it with repeated sales terms. If you want a small cichlid with real behaviour, this is a stronger choice than a generic community fish. If you want a very calm aquarium with tiny shrimp and delicate fish, choose something gentler.

Water Parameters

Temperature 24-28°C is a sensible aquarium range
pH Neutral to alkaline is preferred; avoid unstable acidic water
Hardness Moderately hard to hard water suits Central American cichlids well
Flow Gentle to moderate movement with good oxygenation
Water quality Zero ammonia/nitrite, low nitrate and regular partial water changes

Stability matters more than chasing an exact number. Use a mature filter, avoid sudden changes and give the fish time to settle. In hard-water UK areas, this species can be more practical than many soft-water South American dwarf cichlids.

Aquarium Setup

Minimum aquarium From around 90 litres for a carefully planned pair or small group; larger is easier
Layout Rock caves, wood, broken sight lines and open sand/gravel areas
Plants Use robust plants or attach plants to wood/rock, as digging is possible
Substrate Sand or smooth gravel so the fish can forage safely
Territories Create more caves than fish so subdominant fish are not trapped

A bare open tank can make territorial behaviour worse because every fish can see every other fish all the time. Break the aquarium into zones with rockwork and wood. The goal is a layout where a fish can leave another fish's view quickly.

Tank Mates

Good options Robust livebearers, medium tetras that suit harder water, peaceful Central American cichlids with space, and armoured catfish in suitable groups
Use caution Other cave-spawning cichlids, similar-sized territorial fish and very slow bottom dwellers
Avoid Tiny fish, delicate long-finned species, dwarf shrimp, very timid fish and cramped mixed-cichlid setups
Breeding note Pairs can become much more defensive when guarding eggs or fry

Topaz Cichlids are not monsters, but they are still cichlids. Give them space and choose tank mates that can cope with a confident fish defending a cave. If aggression rises, adding more hiding structure is often more useful than adding more fish.

Feeding

Staple Quality cichlid micro pellets or small sinking pellets
Variety Frozen brine shrimp, daphnia, bloodworm in moderation and chopped seafood-style foods where suitable
Plant matter Spirulina foods and vegetable-based flakes help round out the diet
Routine Small portions once or twice daily; remove excess food

A varied omnivore diet supports colour, body condition and breeding readiness. Avoid relying only on rich frozen foods, as Central American cichlids do best with a balanced routine rather than a constant heavy-protein diet.

Size Options and Ordering Notes

3-4 cm Best for growing on and easier introduction to a planned aquarium
5-6 cm Larger juvenile/subadult size when available
Over 6 cm More developed fish when available; allow more territory
First order Use WELCOME10 when eligible for 10% off your first order
Arrival cover Covered by our Live Arrival Guarantee when delivery and acclimation steps are followed

When available, livestock is packed for overnight live-animal courier delivery. Check your aquarium before dispatch day, especially temperature and water quality, so the fish can go into a stable tank rather than a rushed setup.

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Best For

Choose the Topaz Cichlid if you want a smaller Central American cichlid with real territory, colour and breeding behaviour. It rewards thoughtful aquascaping, steady water and sensible tank-mate choices, and it is a much better fit for a structured cichlid aquarium than for a soft, delicate nano community.

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