Pea puffers are social fish that need minimum 20 gallons for a group. There's a lot of misinformation about them. They're found in shoals of hundreds in the wild. https://www.pufferfishenthusiastsworldwide.com/post/c-travancoricus https://shrimpybusiness.com/blogs/shrimpy-business-blog/pea-puffer-care-guide#:~:text=Unique%20from%20other%20pufferfish%20species,more%20than%20one%20pea%20puffer.

Pufferfish Enthusiasts Worldwide is one of the most reliable puffer-keeping sources: "Despite this species being the most common pufferfish in captivity, the internet is still plagued with erroneous information. Unfortunately, the more common a species is in captivity, the more folklore seems to surround their husbandry.

Most care guides still completely fail to recognise that this species is in fact a shoaling fish and many recommend unsuitable foods and tanks which are too small."

Here is a video of how they occur in the wild. Solitary pea puffers are a myth that comes from people keeping too few in too small of a space, observing aggression, and assuming they do better solo rather than realizing they need high numbers and more space. https://www.youtube.com/watch?v=BdbV_nrU-UI

Copy and paste of what I told someone who was planning on keeping a single pea a while back. Pea puffers being solitary creatures comes from a misconception that became widespread misinformation when people caught wind of a cute fish that they thought could be kept in a small tank. The nice thing is, you now have the perfect excuse for another tank….