According to my sources, they say 6 can be kept in a 10 UK gal. However I wouldn't reccommend this, I'd say at the very least 5g per toad. I keep one in an 8g, but something a bit bigger is planned for the future.
Firebellied toads actually like company of their own kind (I'm hoping to obtain another soon) and are very sociable creatures. I see mine a lot, and he feeds from my hand now, it's great!
ok thanks again, i probaly shouldnt get 1 then, not enough room, i have a spare tank that i bought at a garage sale a few weeks ago and i thought i might try reptiles, i thinks its only a 5 gal US tho