Okay, benifit of the doubt time, RTCs often eat rocks, etc, why not a magnet, as for dragging it around, that seems a bit exagerated. As was said earlier, just keep feeding it, cats puke up stuff they can't digest.
I have some military issued airplane magnets that when you put them together it is really hard to get apart, we might be able to pull a RTC around the tank with them. Simple float magnets, I don't think so. When I move my RTC I end up getting the whole room soaked and the fish on the floor (now that is power), and it is about 20 inches. Good laugh