Resolving Bullying and Poor Water Quality in an Overstocked Biorb

Tank Is Too Small

30 liters (~8 gal) for 2 orfe (grow to 18") + 4 minnows = severe overcrowding. Orfe are fast, predatory, need huge swimming space.

Bullying Dynamics

Fin flaring = dominance/breeding. Orfe chase minnows instinctively. The smallest minnow is targeted—raggety fins, rapid breathing = stress + poor water.

Immediate Actions

1. Rehome orfe to a pond ASAP.
2. Test ammonia, nitrite, pH. Expect high ammonia.
3. 30-50% water changes every 2-3 days.
4. Add air stone.

Long-Term

Biorb is unsuitable for orfe. Keep minnows (white clouds, rosy reds) in a 20+ gal tank with filter.