Children, hush up and let mummy talk now, okay? Okay.(sorry, the temptation was just too strong to resist
)
It's a pity you're getting rid of your CAE. i love mine and he doesn't bother any of my ther fish. I give him an algae wafer everyday and make sure he has a cave-like decor to call 'home'--yeah, not many people know but they MUST HAVE A CAVE TO LIVE IN ON THEIR OWN--and the only time he chases the other fish is to protect his territory. Nothing ever goes further than that. Most people just don't know how to take care of CAEs so they have a bad rep. Ottos and any other scavenger will do the exact same thing as CAEs if they are starved. However, cories ARE a lot cuter.
Good luck with your fish!