Today I got a beautiful black moor goldfish, but all he seems to do since I put him in my tank is chase around his only tank mate : my bronze fantail Siddhartha. Poor Sidd now cowers in the corner. I've also noticed some nicks in Sidd's tail fin. I would return the new guy, but I called to find out they have a no return policy. What do you recommend I should do? For the time being I put it in my sister old beta bowl (something I DO NOT want it to be in long).