i would add only one angel, i put 3 in my 56 gallon and two paired and killed the third, but they have gotten along fine since....my tank has bloodfin tetra's, rainbows, royal clown pleco, 4 clown loaches, who will eventually be moved, a couple swordtails, and sailfin mollies. In the past i had serpae's and headlight tale light with them and they got along fine (although i had them in a group of six of each and they schooled together, i've been told they can be nippy). I've been told any of the larger tetra's should be alright. My rainbows and tetra's are kind of cool because the rainbows are juveniles and are schooling with the tetra's.