Peppermints, and far as I know "can" eat inverts, but normally dont(not that ANYTHING is normal in this hobby
Are you sure that they themselves have enough to eat?? I feed my guys twice a week, some freeze dried Krill or shrimp. ir fresh..Just little tiny pieces..and they will all come to feed now..Even my sally lightfoot..which are usually VERY skiddish..
As a matter of fact, my cleaner shrimp (Skunk) runs up and down my arm, and has to be fed first, or he'll go and grab it away from who ever is first, if its not him..
Maybe you might want to try giving the shrimp alittle xtra, (crabs too)2 times a week...
And get a book or go online and look at your shrimp, as oppose to Camelback, if its Camelback...I would return them..
Just a thought
~Susie
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