How many gallons???

[Foxhuntkid]

I have 3 babie GSPs that are getting pretty big. They will need a larger tank soon and I want this to be their last tank (Idon't really want to set up any more for the same fish). How big does it need to be w/ out the puffers killing each other???

[crazedpuffer]

GSP's need 30 gallons each and good filtration.

[Nick]

A 90 gallon is the best common tank for that, it's like a 55 but deeper and taller. You could probably squeeze them into a 75 if you made up the gallonage with a sump 20 gallons or greater, if a 90 gallon is hard to find or won't fit on your stand or something else. Since a 90 is only taller than a 75, the gallons being in a sump won't matter to the fish.

[manutius]

I would gop with the biggest tank you can find above 75G as Nick says. Using a sump will be better than multiple filters IMO. Have you read up on them in the pufferpedia?