GaryE
Fish Gatherer
The Geos will probably mug the Mikrogeophagus eventually. Same niche but an enormous size difference. The niche means competition. Geos are generally gentle if you avoid argyrostictus, but a niche is a niche. I had Biotodoma with one of my groups, but they are much tougher than GBRs. Cultivar form rams are pretty weak in general.