That's sweet man. My wife won't let me do anything like that. That's why I am making a removable wood tank. What do you feed your CKs? Mine seem to barely grow at all, and I am affraid that my catfish will eat him eventually. They are awesome fish with a nasty attitude. You're gonna have to get in there with them for size comparison, or just hold up a ruler beside the tile so that we can see how big it is for comparison. Rather see you in there with them lol, good luck swimming with CKs that huge lol.