Bolivian and German blue/gold rams, kribs, spotted and striped raf cats, other angels, possibly discus, ancistrus, corydoras, dwarf gouramis, blue/gold gouramis, clown loaches, swordtails, halfbeak livebearers, blue acaras, and I'd possibly have to say, anything larger then 2 inches that are calm and peaceful. They can also be kept with O's.