Angels will eat a whole bunch of smaller fish, neons and cardinals included. (I had originally written excluded, but that was obviously wrong.) I do not believe that your angels will work with glo-lites either. Anything the same size as those or smaller, or a little larger with the same general shape will be angel food. I do not know what Festivums will do, but beware the nasty nature of angels, especially with tetras who are new tankmates and thus seen as food.