Do Pea Puffers Puff Up? Yes. It is rare, but you may catch your pufferfish in act of puffing up as a defensive mechanism or just for practice. Pufferfish puff up by sucking in water to increase their size and discourage would-be predators.

Do Pea Puffers need air pump?

While I do use air pumps in some of my tanks, they aren't required for pea puffers. Pea puffers can manage fine without an air pump. However, it won't hurt a thing if you want an air pump in your tank.

Why does my puffer keep puffing up?

Pufferfish will “puff up” as a defense mechanism if they are threatened. A shape that is more than double its original size, round and sometimes covered in spines is much more difficult to bite and isn't very appetizing to a predator. ... Most puffers are toxic to eat.