The problem with Alkalinity (Kh
) is that it is complicated. Basiclly it represents a relationship between carbonate and bicarbonate which is carbonate hardness basiclly another way to measure alkalinity. We often hear about corals needing calcium to grow thier skeleton well just as much so they need a stable Kh
with out the proper stable Kh
your corals will not be able to use the Calcium in the sea water. I've seen my tank with an extremely high Calcium reading and a low dkh
reading and to fix this I stared dosing Alk
supplement when I buffered my dkh
to 9.0 I noticed a gradual decline in my Ca
levels. Now I have everything balanced and my dosing is done through my top off water. What salt do you use? Do you add any ph buffer?