Will rust kill fish

  • We are currently upgrading MFK. thanks! -neo
I'd say so. I never put any kind of metal in my tank, save for whatever is built into the tank, heater, or filter.
 
Good question.

If it's a pure iron nail, I don't think it would. Rust = iron oxide. Plant fertilizer has iron in it and is safe for fish. I suppose if you dumped a bunch of nails in it might overdose things, but I doubt dropping a nail in your tank would kill things off.
 
probably not but other heavy metals might
 
The driftwood in my tank has nails holding it to a board, and I've had the same piece in my tank for almost 10 years without problems.
 
The old-school way of adding iron supplementation was burying iron nails in the gravel of planted tanks lol...also, as mentioned, driftwood is mostly held on with screws.
 
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