Its not meant for human consumption, but I don't think its going to harm you. Its probably like eating grass or dirt.
I highly doubt it's harmful unless it contains some toxins, but then again your fish would die as well if you're eating the samet hing they are haha. It's fine, don't plan on tasting it to see if it's alright though. Now turtle food... there's something.
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My fish have been dead for a while I think its cuz no one fed them tho xD... and where'd you get those quotes from longhorn...