What is it with dwarf puffers lately? They are the pet of the month at walmart and the sign says they need five gallons. A lot of people, from what I hear, keep them in small tanks as you would a betta. I was under the impression that even though they only get an inch or two they needed a 30 gallon tank ideally. I don't think I'd ever get one for less than a 10 gallon tank. Sorry but I don't know much about their bioload or what environment they prefer, but isn't 5 gallons a little small?