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Today I noticed that one of my Harlies has what look to be small bruises down the right side of his body... What does that mean? They are little redish blotches (that look like bruises). Some of the blotches are tiny and a couple of them are about the size of his scales. None of the other Harlies in the tank (or any of the other tank mates) show any signs of the same thing or any signs of stress. This Harlie is still eating normally, swimming with the school normally and breathing normally...

He is in a 20g tank... Ammonia and Nitrites are at zero, Nitrate is around 20. Water temperature is between 78-80 degrees (F).

Any information, suggestions or comments would be greatly appreciated. Thanks everyone!