I just noticed my new Koi has an injury on either side, low, right between the 1st and second set of fins. He's very light colored there, so I could have missed it when I got him (I've only had him for three days).
I tested the water with a good test kit and everything is good. The fish don't seem to be fighting at all (he shares the tank with three Goldfish). He seems very energetic, swims and eats normally. There doesn't appear to be any damage to his fins and he has no parasites or fungus that I can see. I don't see anything sharp in the tank that could have hurt him.
Any ideas?
I tested the water with a good test kit and everything is good. The fish don't seem to be fighting at all (he shares the tank with three Goldfish). He seems very energetic, swims and eats normally. There doesn't appear to be any damage to his fins and he has no parasites or fungus that I can see. I don't see anything sharp in the tank that could have hurt him.
Any ideas?