i just bought a royal gramma and clownfish and they are currently in quarantine in a 13.5 fluval evo. The royal gramma is nipping the clownfish is he goes near his side of tank. I know they are territorial (especially in a smaller tank) but worried he will continue to nip my other fish when he is moved into DT (80g). I’ve had problems with nipping fish and had to tank out Rock work and corals in order to get them out and don’t want to have that problem again. What should I do?