Your theory about the bad food is plausible to me, although I have never heard of anything like that. The only other possible explanation I can come up with is a nasty parasite or fish disease that came up out of nowhere. But, I know it's likely you would have seen some evidence of sick fish before they all died. Just to be safe, you might want to leave your tank fish-free for a month to be sure all traces of any possible parasite have disappeared. This is a tough one, sorry!



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