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Did it have any other “stress” markings at the time? I think full males do get red in that area, so it’s hard to say.
Hippos are so hard to judge. Die to the fact they constantly go in and out of rockwork and wedge themselves. I never worry about the couple of spots over seen on mine. I have 3 acanthurus tangs and surely if it were parasitic in nature it would be seen on other fish.Bump for worried fish parent ;Smuggrin