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[APD] Re: Aquatic-Plants Digest, Vol 12, Issue 17

Hello Laith,

Dolomite IS calcium and magnesium carbonate, so that is what's contained in those pills.

It would be MUCH cheaper to use agricultural grade dolomite (used to make soil more alkaline). It should be available in garden supply stores. Remember, that dolomite is not very soluble, so you will have to place it in the filter or hang it in a "sock".

If your tank is not too large, then it would be simpler, and not too expensive, just to use any of the RO water additives.



I've been noticing that my tap water KH has gone down drastically over the
past 6 months; from a high of around 15 to 5 or 6 these days. I usually
don't measure GH but when I did and got a reading of 0 (actually the color
changed after 1 drop so it could be between 0 and 1) I thought the GH test
kit was off.

Today I spoke to my lfs and they said that the local water supply had gotten
a lot softer. Also I've noticed that some new leaves, especially on my
Alternanthera plants, were growing very small and crinkled.

So, the good news is that I no longer need to use RO water. The not so good
news is that I need to raise the GH of my water...

My tank currently has a KH of 3.5, GH of 0, pH of 6.6.

Off I went to the pharmacy and found a Magnesium+Calcium product (produced
from a "dolomite sand from Norway..."). It comes in the forms of pills, each
of which contains 100mg of Calcium and 60mg of Magnesium. As I didn't want
to raise the KH, I didn't want to go the Calcium Carbonate (CaCO3) route.

So, according to my calculations, 15 of these tablets will raise my GH by
1.05 (200l aquarium)? This based on 1 GH being 7.14mg/l of Calcium?

Therefore if I add 30 tablets, that will raise the GH by 2.1 and will add
9mg/l of Magnesium.

Could someone please double check my calculations and I'd also like to know
if that level of Magnesium in the aquarium is ok?

Many thanks!


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