I always read about CAE getting mean and not eating algae when the get older and all this stuff. I had a CAE for over 3 years and he NEVER stoped eating algae until the day he died. He wasnt the nicest fish, he just didnt like anything in his "bubble", nothing crazy.
Also I think the the whole "algae eater" thing is the biggest misconception in fish keeping. There really isnt a need for one in a tank unless you like the way it looks and/or acts. They arent these almighty cleaning machines. I have had lots of algae in my tank that housed 7 ottos 2 BN and a CAE. They only eat what they want. MY BN NEVER EVER EVER leaves the peice of driftwood i have. If you keep up on weekly PWC you shouldnt have algae. Right?