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Re: GH

> Hi Everyone,
> If my GH is 9 do I need to add magnesium to my tank for my plants?

Very unlikely. Possible but very unlikely. Why don't you call the water
department up and ask?

> Would an excess of magnesium kill fish/plants?

It seems to take an awful lot and I'm not sure what the upper limits are but
for most plants in a CO2 planted tank, say 100ppm of Mg at least. That's a
fair amount. That's what my tap has anyhoo. SO4, Ca even higher
Tom Barr
> Thanks!
> Sam