if it was still cold refreeze if it was warm when you found then you have no idea how long it was thawed and warm and I would toss it. Plus refreezing in our freezers is a much longer process and does something to the consistency of the food so it could be mushy. When they package the food they flash freeze so the moisture does have time to expand and tear apart the fibers of the food
FWIW I've purchased various frozen foods in the middle of summer and because my car didn't have an air conditioner and the LFS was exactly a stones throw away the food turned to mush on the way home. Three or four hours in the freezer and it was brand new again. Don't OVER think it, it's just fish food. GL.
I just watched my blenny eat a turd straight from my wrasse's butt. I don't think they care.
I'd refreeze it unless it smelled like ammonia. If I was really worried I'd feed a little to the tank and see if they eat it. Animals are dumb about a lot of stuff but they are smart about things like this. If it's sour they'll spit it out.
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