I got two Banggai Cardinals for my tank on Sunday. One of the Cardinals has an injuried fin. I never saw it at the store or in the bag so I don't know where it came from. His right fin is slighty red and fleshy at the point it meets his body. He has not used it to swim, he's only using his other fin. He's eating well and seems to be getting around good... Hopefully he'll pull through. I'm just going to feed him good food and watch his progress. Any other ideas?