very nice tank! it would probably be very hard to get the angel out unless you are able to trap it. i had a similar problem with my true perc in my 29g, infact it killed a pygmy cherub i tried putting in there i was finally able to put in a 6-line that was too fast for it but eventually the clown got the 6-line as well. now there is a purple psuedochromis in there with the clown, for some reason the clown never paid any attention to that fish...