The only other thing I can think of kind of goes along with what sevank said about parasites. All I fed her was frozen minnows I bought at the bait shop. Maybe something was wrong with them.
Night crawlers, minnows and other bait can be chemically enhanced to attract fish. Assuming you bought them at a bait shop?
Either way sorry, try different kinds of pellets and flake as soon as you get the fish. Their re acclimating anyways so their chances of accepting change imo is greater.
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