Thise pictures make me want to go out and get a 10 gallon and set it up with puffers. I tried one in a community tank, a few years back and it did not make it. 100% my fault.
I think a tank with just them in it would be great or would they mix with a male betta?
We have a betta at work, maybe I can upgrade him to a 10 gal with a few puffers. There is a perfect space for a 10. I might just upgrade the betta anyway...