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No idea....no other fish in the tank have anything like it...he ate dinner and everything...swimming fine, it doesn't seem to bother him...just worried. Should I pull him out and treat for something? Increase the water changes only?
Really hard to get a good pic.
It's almost completely gone today....I didn't have time to do a water change last night as it was late when I noticed the spot. What could it have been? Think it'll come back?
Could have been a small sore from running into a rock or something? Maybe a burn from bumping into the heater? I wouldn't worry as long as it doesn't progress worse.