I have one in a 30g tank although many people keep them in smaller tanks. There is a huge thread on RC discussing them, I'll see if I can find it when I get home from work. I've had mine for a few months and have luckily got him to eat frozen food, but some will only take live. Liveaquaria.com sells them. I got mine at my work(thatfishplace), if you can't find one let me know, we don't have them on our website yet but I'm sure we could send you one because we usually have a few in the store.
They definately are interesting fish, but they don't move around too much. Mine usually walks around the bottom looking for a good perch. I hve only seen him swim on a handful of occassions and it's only for a couple seconds.