Yeah i used to keep CAE's myself, had a beautiful golden one once but as it matured it turned very agressive towards all the other fish in the tank. Had to be moved to a tank on its own at 5inches long, but it ended up dying during a particularly long powercut.
They are very attractive fish, but there's not an aweful lot of fish you can put with them that are safe with them.
They can also easily grow to 10inchs long given a chance, so aren't a great deal smaller than common pleco's, so if you are looking for something smaller these are not the fish for you.