I was looking at bags of frozen shrimp in the local grocery store to feed my dwarf angel and latticed butterfly. Nitrate and phosphate were listed on the package as preservatives, so I did not buy them.
However, they have fresh shrimp at the fresh fish counter in the same store. Next grocery outing, I'll ask if they use preservatives on their fresh shrimp. If they don't, I'll pick up a few, freeze them for later use.
As for mysis, there should be a list of ingredients on the package as well. The only ingredient that I don't know is not phosphate on the PE mysis package is "ash". I use RO to rinse the living heck out of the PE mysis well to get rid of as much oil as I can.
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