I'm not sure if there is. There is a pretty neat fish forum called Monster Fish Keepers that I frequent. I'll check in just a minute to make sure there's not a sub on here - if there is, I'll post my fishies too!
If you're worried he's a little chubby, you could do what I do for mine - make him an exercise bin. I use a rubbermaid container, line it with wet paper towels, and stick on a latex glove. I then annoy him to make him run in circles around the bin. I actually only had to annoy him the first couple times, after that he took the hint and now hops around on his own.