Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
They are variable. Nice for a while, then they can turn and attack. A friend had some that were as nice as you please for a couple of months and came home to a disaster.
I would keep them in a species tank.
A large enough tank for them to have plenty of room to explore. They are active and curious, and will investigate any changes you make, so plan on adding something or swapping things out often enough to keep the Puffer entertained.