A jewel-colored dwarf cichlid from South America, prized for its iridescent blues and bold personality in a tiny body. Beautiful but demanding: it needs warm, pristine, soft water and a fully mature tank.
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Orinoco Basin, Venezuela and Colombia, South America
Origin
New World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Cichlidae
Genus
Mikrogeophagus
Part of the Cichlids
Cichlids are a large, behaviorally complex family of freshwater fish prized for color, intelligence, and elaborate parental care. They range from peaceful dwarfs to highly territorial Rift Lake and Central American species, and most demand stable water chemistry and thoughtful tankmate selection.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Pair planted tank
20 gal / 76 L long planted
Mikrogeophagus ramirezi requires warm soft acidic water (pH 5.5–6.5, 27–30 °C) and mature parameters. 20-gal long minimum for a pair, with sand, driftwood, plants, and peaceful tankmates. Sensitive — mature tank essential.
Recommended
Planted community pair
29 gal / 110 L long planted
29-gal long planted with a bonded pair, flat stones for spawning, peaceful dither fish, and very stable warm soft acidic water. Excellent parental behaviour in well-set-up tanks.
Aquakeeper14 / CC BY-SA 3.0 (Wikimedia Commons)
Photo coming soon
Ideal
Amazon biotope pair
40 gal+ / 151 L+ Amazon biotope
Amazon biotope with leaf litter, driftwood, very soft acidic water, peat-leached, and a pair plus dithers. Most natural parental display and richest colour.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
A pair needs a well-planted 20-gallon (or larger) aquarium with a soft sand substrate, gentle flow, and plenty of cover such as driftwood, rounded stones, and broad leaves or flat rocks that serve as spawning sites. Subdued lighting and floating plants help them feel secure.
Water quality is critical: keep temperatures warm at 78-85°F (26-29°C), pH around 5.5-7.0, and soft water. Rams are notoriously sensitive to nitrate and to immature tanks, so only add them to a well-established, fully cycled system with a track record of stable parameters. They are best kept singly as a bonded pair rather than crowded with others of their kind.
Substrate
Fine sand or smooth fine gravel is ideal, since rams sift the substrate and dig small pits when spawning. A dark substrate calms them and intensifies their blue-and-gold coloration.
Equipment & setup
Rams demand warm, soft, acidic, and above all clean water: heater set high at 82-86 F, a gentle filter (sponge or low-flow canister) and pristine parameters via regular water changes. A planted 20-gallon-plus tank with flat stones or broad leaves for spawning sites and some shade from floating plants suits a pair.
Diet
Offer a varied diet of high-quality micro-pellets and flakes alongside frequent frozen and live foods such as baby brine shrimp, daphnia, cyclops, and bloodworms. Their small mouths and slightly timid feeding style mean they do best where faster tankmates do not strip the food first.
Feed small amounts two to three times daily. Good nutrition supports their intense coloration and breeding condition.
Behavior & temperament
Despite their size, rams are true cichlids and form monogamous pairs that defend a small territory, especially when spawning. They are otherwise peaceful and can share a calm community of small, warmth-loving species. Avoid boisterous or nippy tankmates that outcompete them.
They are curious and engaging, sifting substrate and displaying to one another. A planted, structured tank with sightline breaks reduces stress and encourages natural behavior.
Health
Rams are sensitive and prone to ich, bacterial infections, and 'wasting' in poor or cold water. Much commercially farmed stock is hormone-treated or heavily inbred, arriving weak and short-lived, so source from reputable breeders when possible. Many losses trace to unstable parameters, low temperatures, or high nitrates rather than a specific disease.
Quarantine new arrivals, keep the tank warm and mature, and perform consistent partial water changes to maintain the stability these fish require.
*This is general care information, not veterinary advice. Consult an aquatic/exotics veterinarian for any sick animal.*
Tips, DIY & hacks
Buy from a quality breeder or look for wild/F1 stock, as mass-produced, hormone-fed rams are fragile and prone to sudden death. They are sensitive to nitrate and ammonia spikes, so quarantine new arrivals and never add them to an uncycled tank; a flat slate tile gives a pair a reliable spawning surface and lets you lift eggs if needed.
