I have a 10 gallon aquarium with a juvenile JD(approx 1") and a common pleco(approx 1.5") who both get along fine. Today at the pet shop, my brother decides he wants to get a juvenile firemouth. When introduced into the aquarium, the firemouth took a liking to a hiding spot in the corner amongst some fake grass. Despite there being plenty of other hiding spots, the JD continually harassed the firemouth, didn't nip at him that I saw, but more annoyed him. The firemouth in return who is barely larger than the JD, nipped at him quite a bit. I separated the two, I have the firemouth in a little 2.5 gallon right now, pending figuring out what I should do here. I have become attached to the JD and I don't want anything to befall him, and am willing to return the firemouth if need be. I need advice!