This is a nice sized tank for some large SAs. I keep 6 large angels and 6 large geophagus altifrons in my 150 with about 50 cories and a bunch of BNPs. You can mix and match a lot of different SA cichlids: severums, angels, geos, festivums, uaru, true parrot cichlids. I don't care for silver dollars because they are very skittish and spook the other fish.