Stuck chromatophores

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I once had a fish spook, torpedo to the far end of the tank, and hit his noggin so hard that I expected he would have broken his neck. He didn't, and no sign of injury whatsoever. Not even broken skin. Had I not seen it happen with my own 2 eyes I would have never been the wiser. This was also a relatively calm tank that had been set up & running with the same fish for several years. That fish never turned black, but he did succumb to some type of illness not long after, eventually stopped eating, and died. Not saying that this is what happened to the fish in this discussion, but keep in mind that for most folks there are several hours in the day/night when we are not closely observing our fish, and sometimes **** happens.
 
^ Right. I don’t know how anyone can definitively state “no physical injury” unless they’ve sat in front of their tank all day and watched the fish. Fish get chased into objects by other fish, spooked by shadows or flashes of light that send them head-first into the glass, etc.

The halfblack discus that were coming out of Asia several years ago were said to have been achieved by dipping the tails in extremely cold water to kill the nerves when the fish were very small. Breeders swore it was genetic but no one could get the trait to show up in fry.

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Well it’s an interesting topic. I’ll keep you posted. Seems to be subsiding.
 
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Also, on a side note this happened over night.
Maybe it was physical injury, but I was right there near this tank at all times. But I guess it could be some sort of trauma.
Also interesting that everything I have read about this is associated with cichlids.
 
I’m just saying I didn’t see anything happen. Doesn’t mean it didn’t.
 
The eartheater is now fully healed. The right side which was not as bad was back to normal in a bout 2 1/2 weeks. It took a full month for the left side to get totally Juru 2.jpgback to normal. The darkened area got shorter and shorter. Now finally gone. The fish never exhibited any abnormal behavior or signs that it hit something.
 
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