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Aquarist Forums => Freshwater General Discussions => Plants => Topic started by: wolfiewill on April 06, 2015, 08:28:09 PM

Title: Gypsum as source of Calcium
Post by: wolfiewill on April 06, 2015, 08:28:09 PM
Does anyone use gypsum or calcium sulphate or CaSO4.2H2O as a source of calcium in their planted tanks? And if so, did you get it locally?
Title: Re: Gypsum as source of Calcium
Post by: charlie on April 06, 2015, 08:37:08 PM
I never did , but know a few here who have, fischkopp & Jetstream can be of help here.
Title: Re: Gypsum as source of Calcium
Post by: lucius on April 06, 2015, 09:23:57 PM
I've been using cuttle bone from PetSmart.
Title: Re: Gypsum as source of Calcium
Post by: exv152 on April 06, 2015, 10:42:47 PM
I was just at a beer brewing store earlier today and noticed they carry CaSO4, never tried it myself, but I have tried Ca(NO3)2, or calcium nitrate.
Title: Re: Gypsum as source of Calcium
Post by: wolfiewill on April 06, 2015, 11:16:02 PM
Quote from: exv152 on April 06, 2015, 10:42:47 PM
I was just at a beer brewing store earlier today and noticed they carry CaSO4, never tried it myself, but I have tried Ca(NO3)2, or calcium nitrate.

You've tried it, and don't use it now? Why?
Title: Re: Gypsum as source of Calcium
Post by: exv152 on April 07, 2015, 01:51:22 PM
Quote from: wolfiewill on April 06, 2015, 11:16:02 PM
You've tried it, and don't use it now? Why?

I don't use Ca(NO3)2 anymore because it adds nitrates which I don't need. Also, our tap water provides 8ppm alone of Ca, and if you use equilibrium on top of that, like I do, it also contains about 8% Ca based on seachem's analysis. So Ca deficiency is very unlikely. Unless you're using strictly RO/DI only for your water changes, I really don't see the need.
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