To jump in on this discussion. I tried to mix in an eiblii angel with my coral beauty in my 55 gallon. My coral beauty chases the eiblii around the tank, although it isn't as much when I first put him in. I actually had them in the same tank with succcess in the past. I think what worked for me though was that in the past, I added both fish at the same time. This way, they are established in the tank at the same time. This eliminated many problems that I am experiencing now. I will end up moving the eblii angel to another tank soon.