I fully support usmc's statements. Even the freshwater and brackish water puffers are not allowed to be kept with inverts. They have been known to eat shrimps, snails and crabs.
Be careful with what puffers you choose. Some can reach 30 cm or more.:shock: When buying them, have the bag double or triple bagged to prevent it from bursting due to their puffing. When they puff, the spines can stood erect and thus pricking the bag and bursting it. very common for puffers to burst plastic bags.