Parasite, salt dip, see pinned/sidebar post under Disease or websearch salt dip ratio, before I had marine salt, I used Kosher salt, just be sure to *not* use table salt or any salt with additives/metals.
For future reference, the link is also listed in our pinned/sidebar post under Disease. (In past years we saw more Ellobiopsidae which was reasonably untreatable, unlike Clado.)
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RadiantStarr 
Did you order them online? If so from who?
Parasite, salt dip, see pinned/sidebar post under Disease or websearch salt dip ratio, before I had marine salt, I used Kosher salt, just be sure to *not* use table salt or any salt with additives/metals.
If ur in Canada u/Pufferfishpussy is looking for fungal parasites
You might be asking about green feathery growth under a shrimp, likely Cladogonium ogishimae, a treatable parasitic algae, [see here for ID/treatment.](https://aquariumbreeder.com/ellobiopsidae-or-cladogonium-ogishimae-green-fungus-in-shrimp-tank/)
For future reference, the link is also listed in our pinned/sidebar post under Disease. (In past years we saw more Ellobiopsidae which was reasonably untreatable, unlike Clado.)
*I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/shrimptank) if you have any questions or concerns.*