Quick Stats
| Adult Size | up to 9 cm (typically 7–8) |
| Minimum Tank | 20 gal |
| Temperature | 22–27°C |
| pH Range | 6.0–7.5 |
| Hardness (GH) | 5–15 dGH |
| Difficulty | Easy |
| Temperament | Peaceful (territorial when breeding) |
| Diet | Omnivore — pellets, frozen bloodworm, blanched vegetables |
| Schooling | Pairs or singles; groups of 5–6 to let pairs form |
Tank Setup
The Bolivian Ram (Mikrogeophagus altispinosus) is native to the Guaporé river system on the Bolivia–Brazil border — slow, warm tributaries over sand and leaf litter. Like its famous cousin the German Blue Ram, it is a dwarf cichlid of the genus Mikrogeophagus ("small earth-eater") that sifts fine substrate for food and pairs for life; unlike the German Blue Ram, it retains much of its wild hardiness, which is why it tolerates cooler temperatures (down to 22°C), harder water (to 15 dGH), and the ordinary mistakes that kill its delicate cousin.
A 20-gallon tank houses a pair; a group of five or six juveniles needs 40–55 gallons and is the right way to buy if you want a bonded pair to form. Set up dwarf-cichlid style: fine sand substrate (they sift it constantly — their mouths really are earth-eater equipment), driftwood, scattered leaf litter or almond leaves, dim-to-moderate light, and clumps of plants along the edges with open sand in front. Half a clay flowerpot or a coconut shell completes it — these are cave-and-crevice spawners and a defined territory anchor reduces chasing.
Temperature 22–27°C, pH 6.0–7.5, hardness 5–15 dGH — no RO unit, no heater-in-every-season, no pH chasing. That parameter envelope is the species' whole pitch: it delivers dwarf-cichlid behaviour in an ordinary planted community tank. Flow gentle to moderate; a sponge filter or gentle HOB is plenty.
Tank Mates
Bolivian Rams are peaceful dwarf cichlids that mind the bottom third of the tank and ignore everything above it. Their tank mate list is long: any midwater schooling fish that shares 22–27°C works — Harlequin Rasboras, Neon Tetras, Cherry Barbs, larger tetras, and livebearers at the harder end of the range. Bottom dwellers need a little thought — Pygmy Corys and Kuhli loaches (Pangio kuhlii) share the floor amicably with a non-breeding pair.
The one behavioural caveat is breeding territory. A spawning pair claims a 20–30 cm circle around their cave and defend it with flaring, chasing, and fin-slapping that never becomes lethal in a 20-gallon-plus tank but does stress timid floor-mates. Cories ride through ram territory calmly and are the standard pairing; shrimp are a conditional — adult cherry shrimp (Neocaridina davidi) coexist fine, shrimplets get picked off, and a breeding pair hunting food for fry will clean a tank of small shrimp.
Avoid the two classic mismatches: aggressive cichlids (even mid-size ones bully rams relentlessly — no Oscars (Astronotus ocellatus), no mbuna, no large Central Americans; see the Jack Dempsey profile for what that side of the family looks like), and fin-nippy schooling fish. Bolivian rams' extended fin filaments attract the same nippers that shred gouramis. Within those limits, this is one of the most community-safe cichlids in the hobby.
Diet & Feeding
Bolivian Rams are omnivorous micro-predators. In the wild they sift sand for insect larvae, crustaceans, and organic matter; in aquaria they take small sinking pellets, frozen bloodworms, brine shrimp, and daphnia enthusiastically, and nibble blanched vegetables. The sifting behaviour is half the entertainment of the species — feed a few bloodworms at a time and watch them mouthful-by-mouthful work the sand looking for them.
Feed once or twice daily with sinking foods — they feed on and in the substrate, so floating rations starve them in community tanks. A diet heavy in frozen protein brings males into their rusty, red-fin-edged breeding dress and conditions pairs to spawn. Cichlid-specific micro-pellets are a good base; vegetable supplements round out the omnivory.
Conditioning for breeding is the same as for German Blue Rams, only easier: two weeks of daily frozen bloodworm or live blackworm, warm (26–27°C), frequent small water changes. Females visibly fill with eggs; males intensify and begin displaying to their reflection in the glass.
Common Health Issues
Bolivian Rams are the hardy branch of a delicate genus. They resist the chronic stress death spiral that German Blue Rams fall into in hard, hot, or unstable water; their honest weak points are temperature shock (they still dislike rapid swings and chronically cold water below 22°C) and the standard new-fish ich. Quarantine, stable temperature, and a cycled tank cover most of the disease risk.
Watch the behaviour barometer: a healthy Bolivian ram constantly works the substrate with visible purpose, and a ram that stops sifting and hovers is a ram with a problem — usually temperature, ammonia, or a bullying tank mate. The nano cichlid hub covers dwarf cichlid disease triage in detail, and most of it applies directly.
One genus note worth knowing: Mikrogeophagus are sensitive to some medications (copper especially, at full dose). When treating tank mates, dose at 50–75% or use scaleless-safe formulations — the ram shares that sensitivity despite its hardiness.
Breeding
Bolivian Rams are open-substrate spawners — they lay eggs on a flat stone, a sunken leaf, or a shallow pit excavated in the sand, and both parents guard the brood in shifts. They are easier to breed than German Blue Rams precisely because they tolerate ordinary water: a conditioned pair in a 20-gallon tank at 26°C with a flat stone will typically spawn within weeks, laying 100–200 eggs.
The pair's parenting is the show. Eggs are fanned and cleaned; hatched wrigglers are moved to a pit the parents dig and re-dig; free-swimming fry are herded as a swarm by both parents. First spawns are sometimes eaten — the standard cichlid apprenticeship — but Bolivian Rams are persistent parents and usually succeed by the second or third attempt. In a species-only tank you can leave the family together; in a community, most fry do not survive predation and the parents' defensive chasing gets tiresome for tank mates.
Fry need baby brine shrimp from free-swimming (about day five to seven post-hatch); growth is quick on live food and daily small water changes. If your goal is simply to keep a charming dwarf cichlid rather than run a breeding project, a single Bolivian Ram or a same-sex pair works perfectly well in a community tank — the species does not require a mate to be itself.
Frequently Asked Questions
What is the difference between a Bolivian Ram and a German Blue Ram?
Colour, hardiness, and temperature. German Blue Rams (Mikrogeophagus ramirezi) are electric blue-gold and demand 27–29°C, soft acidic water, and pristine conditions; Bolivian Rams are subtler — grey-tan with red-orange fin edges and blue-green flecks — but tolerate 22–27°C, harder water, and ordinary community tank standards. German Blue Rams are the more spectacular display fish; Bolivian Rams are the one beginners can actually keep. Both pair, guard fry, and sift sand the same way.
Can I keep Bolivian Rams with German Blue Rams?
It can work in a 40-gallon-plus tank with careful temperature compromise (26–27°C suits both), but it is not recommended: they are the same genus, occupy the same floor niche, and will compete for territory continuously. Mikrogeophagus aggression is mostly display, but constant territorial dispute stresses both species. Choose one or the other per tank.
How many Bolivian Rams should I keep?
A single ram or an established pair are both perfectly valid choices — this is not a schooling fish. If you want a pair, buy five or six juveniles for a 40-gallon-plus tank and let them pair naturally, then rehome the extras. Buying a "pair" sight-unseen risks two males, which will fight indefinitely.
Are Bolivian Rams beginner-friendly?
Yes — genuinely, which is unusual for a cichlid. They accept tap water hardness, cooler temperatures, standard flake-and-pellet diets, and community tank mates. The requirements that matter are a sand substrate (their sifting behaviour needs it), a cave or flat stone to call home, and no aggressive companions. Of all the dwarf cichlids, this is the species to start with.