Just thought I'd post a pic of Bruce my CAE. He is nearing 8" and still peaceful as can be. Of course I think this has something to do with being housed with several large African cichlids!
As an interesting reference of size, here he is about 18 months ago.
He got punked out LOL. You nailed that on the head JC, he did the try and suck on a fish thing and 5 africans attacked him. The yellows were a close nit group back then. He now sucks on the glass, the rocks, the driftwood but never ever another fish.