[APD] Hard water

[Hal Craig <phasespider at yahoo_com>]

Is it possible to have hard water with a very low
amount of magnesium in it?  I live in central Florida
and I believe our aqua fir is mainly limestone.  Would
that lead to low amounts of magnesium?  My water out
of the tap is around a GH of 8.  The only thing I
haven?t been dosing is Epsom salt since my water is
already hard out of the tap.  I have been dosing all
the other fertilizers separately and monitoring them
with test kits.  I do have good lighting and CO2. 
Still my plants will not grow well.  

Thanks for all replies
Hal


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