German Black Ram (Mikrogeophagus ramirezi – black form)

The German Black Ram is a selectively bred line of Mikrogeophagus ramirezi – the same species as the German Blue Ram, just bred for melanistic (extra-dark) pigmentation. Everything in our Blue Ram guide applies to Black Rams too, but there are a few quirks worth noting. This is the long version; if you have already kept Blue Rams, skim it.

Quick Stats

Scientific name: Mikrogeophagus ramirezi (selectively bred color form)
Adult size: 2 to 3 inches
Minimum tank: 20 gallons for a pair
Temperature: 78-84°F
pH: 5.5-7.0
Hardness: 2-8 dGH
Diet: Omnivore, leans carnivorous
Temperament: Peaceful, territorial when breeding
Lifespan: 2-4 years

What is different about Black Rams

Black Rams are the result of decades of line-breeding for darker pigmentation. The most striking specimens are nearly black across the body with iridescent blue speckling, almost like a galaxy on a fish. They are stunning under the right light, but the selective breeding has costs. Black Rams tend to be slightly less hardy than wild-type Blue Rams, with a shorter average lifespan and a higher rate of swim bladder and spinal issues. They also tend to be more shy.

None of this means you should not keep them. It does mean the margin for error is smaller. A tank that just barely works for Blue Rams will fail for Blacks. Get your water chemistry and temperature dialed in first, and only add Black Rams to a mature, stable system.

Tank setup

Use a 20-gallon long or larger with fine sand, plenty of plant cover, and at least one or two flat stones for potential spawning. Black Rams are even more sensitive to bright open tanks than Blues. We use floating plants (frogbit, red root floaters, Amazon frogbit) to dim the light from the top down, plus Cryptocoryne and Anubias for mid-level cover. Driftwood with some Indian almond leaf litter on the substrate gives them the shaded, tannin-stained look they evolved to live in.

Gentle filtration is essential. A sponge filter run off an air pump is perfect for a species tank. For a community, baffle your canister or HOB output so there is no strong current. Heater redundancy matters too – if your room cools at night and a single heater fails, Black Rams will be the first fish to show stress.

Water chemistry

Same as the Blue Ram: warm (80-84°F), soft (2-8 dGH), and slightly acidic (pH 5.5-7.0, ideally 6.0-6.8). Our Key West tap water is hard and alkaline, so we cut with RO and add tannins. If you are on well water in a soft-water region, you may be able to use it as-is. Stability beats precision. Nitrate should stay under 20 ppm. Black Rams react badly to nitrate above 30 – you will see clamped fins, faded color, and reduced appetite well before any other tankmates show stress.

Diet

Frozen and small live foods are best. Baby brine shrimp, daphnia, cyclops, frozen bloodworms (sparingly), mysis, and a quality micro pellet should make up the rotation. Two small meals a day, with one fast day per week. Black Rams are sometimes pickier than Blues about pellets, especially when newly arrived; bloodworms and brine shrimp will usually get them eating.

Tankmates

Black Rams want quiet tankmates. Good choices include cardinal tetras, rummynose tetras, ember tetras, small pencilfish, hatchetfish, sterbai or aeneus Corydoras, and ottocinclus. Avoid nippy fish (tiger barbs, serpae tetras, some danios), boisterous fish (large rainbowfish, larger gouramis), and cooler-water fish that do not tolerate 82°F. Other dwarf cichlids can be a problem; two ram species in the same tank usually means one is hiding constantly. We do not recommend mixing Blue and Black Rams unless you have a 40-plus gallon tank and lots of sight breaks.

Two Black Rams of the same sex will often fight more intensely than Blues. If you want a guaranteed pair, buy four to six juveniles and let them sort it out, then rehome the singles.

Sexing and breeding

Sexing Black Rams is harder than Blues because the melanism hides some of the usual sex markers. Look for the same cues – males have a pointed, extended first dorsal ray and a slimmer body, females have a pink or red belly that becomes very obvious when ripe with eggs – but expect to second-guess yourself. Once a pair forms, behavior tells you everything: a real pair will defend territory together and dance face-to-face.

Breeding mirrors Blue Rams: a flat stone cleaned by both parents, 100 to 300 eggs, both parents tend, fry free-swimming in about five or six days from spawn. Black Rams are notorious for eating their first few spawns. Do not intervene. By the third or fourth round, most pairs settle into competent parenting. If your pair never raises a brood, you can pull the eggs and artificially raise them with an air stone and methylene blue, but expect a higher rate of deformities than with Blues.

Common diseases

Ich, hexamita, fin rot, and the usual cichlid bloat are the common ones. Black Rams seem more prone to swim bladder issues than Blues, often genetic and not curable. If a Black Ram floats or sinks abnormally, isolate it, feed a fasting and peas regimen for a few days, and if it does not resolve, accept that not every fish from a heavily line-bred strain is going to thrive. Avoid copper-based meds where possible; rams of all kinds are copper-sensitive.

Buy Black Rams from a source you trust. We do not ship rams of either color form to brand-new tanks. If your system is under two months old, hold off.

Ordering from us

We ship Mondays and Tuesdays and hold orders if either Key West or your destination is forecast to hit extreme temperatures. Full procedure is on our Shipping & Acclimation page. Drip acclimate over 60 to 90 minutes – slower for Black Rams than for hardier species. For water parameters, see our Water Chemistry guide.

If you have kept Blue Rams successfully and you are ready to step up the difficulty a touch, Black Rams are a beautiful next chapter. If you are new to rams entirely, we would point you to our Blue Ram guide first. Email us at help@jojoaquatics.com if you want to talk through your setup before ordering.

— The JoJo Aquatics team, Key West, Florida