One of my original Zebra Danios seems to have hurt himself or got hurt and I was wondering if there is anything I can do about it. I bought the tank shortly before Christmas last year and he was one of 4 danios I got to cycle the tank with. I woke up this morning to find him swiming at an angle (his tail is down and his head is up) and one of his side fins doesn't appear to move properly. Is there anything I can do to help him recover or is he a gonner?