well with a 90 gallon tank, most people on this site would advise u to only go with one angel, preferably a dwarf. to put a large angel such as an analarius or a french ( which will get very large 10-12 inches ) would just be too tight of a fit. and to put a large angel with a dwarf, you just dont have the room to do it. i know this is hard to hear, but this is my advice. but; the cool thing about being human is that u have ur own free agency, soooo, if u really want to do it, then do it, but me, as well as others here, would say its not a smart thing to do. just not enough room to do it and will be hard on ur water paramaters