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What do you mean it can't control itself? Is it swimming in circles? Can't swim straight? Is trying to swim and cant? These are usually not neurological, rather connected to the swim bladder or an infection of some kind.
 
Well what is the fish doing? And saying "acting crazy" is not a description, it is a judgement. For instance my angel fish is touching his mouth to the side of the tank, going back and forth, next to the female angel. That is description. A judgement would be to say they are getting ready to spawn.
 
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