Fish eating white worms from each other's butts

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It was sort of funny to see - I just wasn't in much of laughing mood because my other fish were dying from the ich complications. The worms were hanging out of the anus of the Paretroplus about .25-.5 inches and then another would grab it, yank, and keeping pulling until a worm about twice as long as what was outside the body came out. The funniest part though was that the fish having the worm pulled out of it's butt seemed sort of uncomfortable, like it experienced a sensation it had never felt before.
 
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