The Midnight Arothron Puffer is a sleek midnight black. It lacks pelvic fins, but has learned to use the pectoral fins to move about the aquarium. It has the ability, when treatened or alarmed, to inflate its body to almost twice its normal size. While “puffed up,” its spines are held straight out from the body to discourage others from trying to eat it. Parts of the flesh are poisonous if digested. Its teeth are actually a fused beak-like structure.

A 100 gallon or larger, fish-only aquarium with a good protein skimmer is suitable. It will eat invertebrates found in a reef tank. It becomes alarmed when netted and will blow itself up for protection, therefore, use a container to transfer it.

The Midnight Arothron Pufferfish needs a varied diet of meaty foods including; squid, krill, clams, and hard shelled shrimp to help wear down their ever growing teeth.