I called the fishtank cleaning guy and scheduled a visit for Tuesday... he's also going to take the catfish out of the tank. :-(
I'll hate to see the big guy go, but it's probably for the best... hopefully the pet store will put him in a nice big tank (75+ gallons) so the fish will have some room to move around until he's sold or dies. Since I have such little time left to take pictures and such, I think I'm going to position the camera/tripod in front of the tank so I can get some video of it feeding/swimming.