I keep mine with fast moving fish. Any bottom sitters are likely to be investigated and a nip is part of a mbus investgation. Mine are in a 650 with tarpon, irridescent sharks, and an af aro. A fair growout tank would be at least 75 gals since these puffers are prone to a quick crash as soon as water parameters drift slightly from perfect. Foods can consist of snails, crayfish, ghost shrimp, raw shell-on shrimp, FD krill/plankton, clams, mussels, etc. Eventually, they can be trained onto FD and stick food. Mine are offered shrimp and crayfish but, they'll go after krill and arowana floating sticks just as quickly. I offer the live foods so I can gut-load them on multi-vits and trace elements to round out the puffers diets.