That's funny, like i said no one ever called them smart. and my other clown is starting to do the same thing and the funny thing is i have a big hammer coral and frog spawn they won't go near.
Some of them will sleep on powerheads if you don't have anything better. They are not picky. Mine slept in the corner of my tank upside down until I got my RBTA.
the thing is I have a rbta, frogspawn big hammer coral and they hang on the brain coral during the day and sleep up in the corner upside down next to my thermometer all night I dont know if they are just clowning around or what. lol