PS - I bought Nielson reactor from My Reef Creation (even though I already have something similar from Tunze) - This is because Tunze's version requies that you shake the bottle (filled with Kalk and water) regularly (by hand - Oh my gawd).
At first I thought water pump will keep the Kalk...
After adding calcium reactor, my PH is much lower (7.9-8.0) and I was worried. My ALK was high 14-16 dKH. While corals and clams look okay, I just had to do something. I purchased a Pinpoint PH controller. I think it's great to shut off CO2 output if there is power outtage - and I was...