when you buy frozen from the supermarket please be absolutely sure the stuff is uncooked and unflavoured. Most frozens in a bag also have stuff as preservatives and something thatbasically fills the food wit water to make it fuller. If you can avoid these preservative and water thingy do so. But be warned that they are very common.
You should also be sure to thoroughly wash the frozens before mixing or feeding or whatever. A common trick in the frozen food trade is to dip the food in chlorine to kill bacteria and stuff. harmless amounts to humans may remain, but these small amounts can be detrimental to our fish and inverts. that's why you should wash it.
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