It really depends on the puffer. I have a 46 gal bow front, that is a community tank, and I have had a figure 8 puffer in the tank for over 3 years with 0 problems. In the tank are 1/2 beaks, sids, cories, L240s, L104s, a full grown SAE, a flounder, some sewellia lineolata, some african 3 stripe glass cats and more. It is moderately planted with a big piece of driftwood in the tank. Never had an issue with fin nipping. I have been looking for a while for another figure 8 to add, but there has been nothing locally. Good luck.