I didn't have that problem with mine. My problem was that it caused crazy ph swings and super low ph that killed off my nitrifying bacteria. My tap water is ph 7.5 but kh is only 2 gh 4 (so very little buffer) eventually it wore out and was easier to deal with. At first it caused my ph to fall below the API test kit. Water changes, even small ones would jump the ph way up and then it would crash down. I would treat it carefully and test often at first before adding stock and see what it does to your water, make sure it is stable in your tank before you add anything.
Just clarifying, if the shrimp are already in the tank I would test it in a separate container, like a bucket and see. Then you know what you will see as far as it's affect on your water. Add it to your tank little by little, don't replace the substrate all at once.
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