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Phosphates are in all foods, but pellets/dried/flake foods are generally considered to be a more significant source. Regardless, I do rinse my frozen foods before putting it in the tank. I thaw it in a cup with RO water, then pour off the water, add more water, then pour that off until the "debris" is gone and the water I'm decanting is clear. Then I add some Selcon and let it sit for about 15 minutes before feeding.
In general, higher quality foods will also reduce the amount of crap that gets introduced with the food. Hikari and Piscine Energetics Mysis are much higher quality and far more nutritious than SF Bay Brand (PE Mysis is 69% protein, SF Bay Brand is 6%-- so that's a no brainer). If I use my decanting technique on a cube SF Bay Brand, there's hardly anything left after all the floating junk gets poured off.
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