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On 7/14/2021 at 11:21 AM, JettsPapa said:

Welcome.  Do you mind if I ask how many puffers you have?  I have 2 in a 40 gallon community tank and am considering more.

There are four in there. I've had no issues with aggression at all. I've kept it heavily planted, with plenty of breaks in sight lines. I think you could do ten in a 40, no problem. 

[Welcome to the C.A.R.E Forum - Look here first.]

Hello all. I've been fish keeping for about a year now, and have gotten really obsessed. There's a 20 gallon pea puffer tank in my office, and a 55 gallon community in the living room. I'm here to learn and share ideas. Cheers!