Considering adding a group of 5 or 6 sterbai or adolfoi or something similar that anyone could recommend(small to medium active) to my south american tank. I'm pretty well stocked, wondering if some corys would work. Tank is 3'x12"x20" planted with branchy driftwood and rocks. Filtration is a single aquaclear 70. Stocking is 2 angels(not a pair), 1 m/2f apisto cauc double reds, and 15 cardinal tetras. I figure I'm pretty much stocked at this point or do I have some room to spare for corys? There is basically no interactions between the species in the tank currently, each ignore the others. One important consideration is that I would like to breed the cauc's. I know the angels will probably hinder that, but I've set up some caves for the cauc's that the angels would not be able to get into. So the question is in terms of stocking, and in terms of interfering with the cauc's breeding(eating eggs, etc) would these work? I'm not really into the dwarf species of cory nor the very large either. Thanks.