I have a 29 gallon with what is now 8 glo tetras(the white/black skirt ones) and 1 Dalmatian Molly. There were more mollies in the beginning until this Molly killed the others. This fish goes through phases of being nice and than it chases the other fish. It seems that it darts at that but doesn’t nip them. Plenty of hiding places/plants and what not. I’ve quarantined the Molly in a five gallon bucket with an air stone and put it back in. Not sure what else to do but it disrupts a peaceful community pretty often.