I had a coral beauty that I bought for my 40G a while back. Had it for about a week, so it was used to the tank, then a LFS got a flame angel in and was sellign it for like 30 bucks, so I was like "wow what a great price, i HAVE to buy that!" completely forgot I already had a coral beauty and that would be 2 angels in a 40G. So I get home, realize this, and was like "oh well, I've already bought it, may as well try it". So I added the flame, they faught for about 30 seconds, if that, then got along fine for the rest of the time until ich killed everything about a month ago when I added a stressed-out butterfly fish that I didn't QT lol