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Re: Ailing neon tetras and water quality

> fish, for this reason. And yet here I was using a small piece of lead, which
> I believe was poisoning the water. (And it's sold for fish tanks, duh).

I doubt lead poisoning did this.  I don't think it would act that quickly, 
and it wouldn't go away after the water change.    Lead build up, and
doesn't go away when exposure ends.  

I'd lean toward some other problem in general water quality.