Gypsum as source of Calcium

[wolfiewill]

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?

[charlie]

I never did , but know a few here who have, fischkopp & Jetstream can be of help here.

[lucius]

I've been using cuttle bone from PetSmart.

[exv152]

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.

[wolfiewill]

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?

[exv152]

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.