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Although you're probably MUCH more experienced than me, i too have experienced this w/ my cleaners. In My 2 most recent cleaners, one had them. (but now theyre gone)
(I've gone thru 4 dead cleaners, all from same store, all died from acclimation. The i bought from 2 other stores, both lively and cleaning.)
I learned that these black spots are just signs of age, aging, or your tank's conditions. They aren't a problem to your shrimps health, just to his looks. It's possible that they may disappear on their own just like mine, or they could change after a water condition change.
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"a fish is only great when it isn't satisifed with the tank as its territory, and jumps out to claim your living room."
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