Does anyone have experience with Bennett Sharpnose Puffers? I added one to my 36 gallon tank 5 days ago and today I noticed my two clowns fins are tattered. One clown is worse than the other. I have seen the puffer dart at the clowns maybe 3 times since I added it to the tank. The clowns were fine before I introduced the puffer. I'm really considering returning the puffer for the safety of my clowns.