I have a 65 gal and plan on upgrading later. I have an angler fish, lion fish, an moray eel, and a clown trigger. They have all done great together but I want a spiny box puffer and had the LFS get one for me. It came in and it's huge like 5" and my angler is only about the size of a half dollar. Is this a no go?? Should I try and get one smaller?