As stated above they are not compatible, as soon as the elephant nose gets large enough to eat an inch long fish your pea puffers are going to be snacks, however you also have a stocking issue because your tank is not large enough for elephant nose fish (more than one) as well as housing them with an aggressive fish (puffer), the elephant nose can range from 8-13 inches and live for several years. Since you have more than one I would upgrade them with suitable tank mates and downgrade the pea puffers to a 20 long (the elephant doesn't do well in smaller tanks with more of their kind around).Sonya said:Not Sure if this is still open. I have five pea puffers with 2 elephant nose in a planted 50g. My brother convinced me that I would not be a problem, and I wanted those fish so I chose to believe him. And so far, honestly they seem OK. Does anyone have experience with these two fish together? I’ve only had them for around six weeks, but I am concerned.
Just because he has kept stuff together does not mean it is a good idea, he just managed to get fish that could tolerate each other (personality wise).Sonya said:My brother kept them together successfully. He always kept large tanks filled with stuff that did not belong together! And it always worked out for him. I was hoping that a dozen or so people would chime in and say “yeah that’s great, we do that all the time!” Wishful thinking!. I have 120 gallon Heavily planted tank With no occupants,and I’m thinking about stocking options. I will move the elephant noses.