Any of the high backed tetras are ok like the serpea, bleeding heart, diamond, black skirt etc. But I wouldent do rummy noses, neon, cardnels etc. I had angels that ate rummy noses and neons. I'm sure others have kept these tetras with angels and its possible that the angels never mess woth them but from my own personal experiance's I would say better use feeder guppys if you want your angels to eat live they are much cheaper.