I've got 7. I'd like to expand that little group to a dozen or so, but finding them at the size they are at is difficult and expensive. I bought 8 originally, at about 1.5", but one died within a month of some bizarre spastic attack, and another died of parasites not long after. I got lucky and found a 3.5" one for $20 at a lfs, and ever since they just keep getting fatter and funnier to watch