09-18-2008, 01:24 PM
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It's a cool idea, and apparently works well. There's a spa in northern Virginia that uses that method, although with a different species of fish (not sure which species, but they're definitely not the Garra rufa pictured in your link).
The biggest concerns I would have are:
1) Apparently, in order for the fish to do their job effectively, they're usually "starved" for a period of time which might not be great for the fish.
2) Unless you did a really good job of cleaning your feet prior to placing them in the tank, I'd be worried about introducing nasty stuff to my tank.
3) The fish pictured there, Garra rufa, are hard to find in the aquarium trade. They often sell for about $10 a fish. I did some digging just now and found lots of 100 fish selling for about $600, but it would be hard to find smaller quantities.