I currently have an adult queen angel in my 125 FO and was thinking about trying to introduce a juvenille emperor figuring trying to introduce an adult would be a disaster,anyone ever try it or should I just forget about it.
There is no guarantee but i've kept them together with no problem. I made sue they were different sizes one is going to bully the other a bit but other then that it should be O.K.
you can do either a juv. or an adult if there's a large difference in size there shouldn't be too much of a problem. But a Juvenile would be less of a risk.