I currently have a single Geophagus Steindachneri in my 120 gal setup. He is about 2.5 to 3 inches long. I have noticed he is a little feisty, it seems to be all in bluff (or play?) as there are never torn fins on any fish sharing his territory. My question is, I wanted to get a group of G. Tapajos. Is that a big no no, or with enough space will everyone be relatively chill. I feel bad, I bought him from a LFS, was told he was a Tapajos but as he grew it was evident he was a Steindachneri. It is not his fault, I love him, I do have my heart on those Tapajos though. Please help, advise for or against keeping them as tank mates.