Can frozen food carry parasites or cause ich? Because last night I fed my fish a mix of hikari frozen krill and San Fransico bay brand plankton. And now they are scratching themselves on the decor and one of my blood parrots appears to have dots on its tailfin. I turned up the temp as a precaution and no other fish has the dots I would have expected my ich sensitive catfish to be the first to show signs if it was ich but everyone's all good. Any advise or knowledge on the frozen food thing would be helpful. Kinda freaking out a little
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