Bought a small redtail on the weekend (4 days ago)and he's in a tank with other equally sized fish. He's moving around fine but he doesnt really seem to be eating much and his redtail is basically transparent with a tinge of red. Al the other fish in the tank are fine and my levels are all normal but just to be sure i did an extra 30% change yesterday. Any help on what might be up with him would be much appreciated.