| Temperature | 24–28 °C (75–82 °F) |
|---|---|
| pH | 6.0–7.5 |
| Min tank | 20 gal (76 L) |
| Adult size | 8 cm |
| Lifespan | 3–5 years |
I still remember the first time a Bolivian ram settled into a tank I had cycled for weeks — within two days it stopped hiding and started behaving like the species actually does. The Mikrogeophagus altispinosus Bolivian ram is a long-time favourite for a reason, but it has specific needs that generic "community fish" advice misses.
At a glance
| Minimum tank | 20 gallons (76 L) |
|---|---|
| Temperature | 24 to 28 °C |
| pH range | 6.0 to 7.5 |
| Adult size | 7 to 8 cm |
| Lifespan | 3 to 5 years |
| Group size | solitary |
Where it comes from
In the wild the Bolivian ram lives in slow, vegetated waters where cover is everywhere and currents stay gentle. Recreating that means planting densely, keeping the filter flow soft, and avoiding bright, open tanks that leave the fish exposed. Stable water matters more than perfect parameters.
Tank setup
Start with at least 20 gallons and a mature, cycled filter — see the Nymphoides Hydrophylla in Low Light walkthrough before you buy. A sand or fine gravel substrate, a few driftwood branches and a carpet or mid-ground plant mass give the fish somewhere to retreat. Keep nitrates under 20 ppm with a weekly 33% water change.
Reading the numbers
For the Bolivian ram, aim at 24 to 28 °C and roughly 6.0 to 7.5 pH, with ammonia and nitrite pinned at 0 and nitrates below 20 ppm. Test every week and change 35% of the water so conditions stay steady.
Feeding
Feed a varied diet: a quality flake or micro-pellet as the base, topped up with frozen or live foods two or three times a week. Offer only what the fish clears in about 2 minutes, once or twice daily. Overfeeding is the single most common cause of water-quality swings.
A mistake everyone makes
Adding a Bolivian ram to a brand-new tank is the classic error. An uncycled tank spikes ammonia to 0.7 ppm within days and the fish pays for it. Cycle first, stock lightly, and let the group size build up gradually.
Good tank mates
Peaceful, similar-sized neighbours work best. Avoid fin-nippers and anything large enough to swallow the Bolivian ram. A planted community with our Best Gravel Vacuum & Water Changer: Clean Substrate, Easy Changes guide in the mix tends to settle quickly.
