A juvenile northern puffer
Despite their ecological and physiological similarities, the two species display very different behaviors in a captivity. Northern puffers Sphoeroides maculatus are extremely aggressive and often bully much larger fishes, using their beak-like teeth to nip at skin and fins. They usually must be separated from fishes with long fins or appendages, as puffers will eat them off. Burrfish however are usually docile and reclusive, at least in comparison to puffers. Because of their unique look, small size (less than a foot as adults) and interesting behavior, both puffers and burrfish are a favorite for aquarists and guests alike.
Juvenile lookdowns Selene vomer can be very ornate and are patterned to mimic sea grass
Lookdowns, a type of jack, have very elongated, elaborate fins as juveniles to help disguise them in vegetation. Puffers however, will eagerly nip at fins such as these and must be kept separately from most species.