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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.
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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

I had noticed a problem with its eyes a few weeks ago and it appeared to be having some difficulty feeding. One pupil was much larger than the other, and the pupil that lens of the eye on the smaller pupil appeared cloudy. I’m not sure if it experienced some kind of trauma or what happened, but it wasn’t like that when it initially went back into the display. Was my oldest surviving fish ;Sorry
