water chemistry

[dreefer]

I have a 135 reef aquarium with a rather large sump. have had problems maintaining my dkh and calcium at optimal levels . have calcium reactor running , knopf reactor with carib sea media. has been operating for over 4 months. no change in levels. Try adding calcium supplements ie..turbo calc to bring levels up , just seems to precip out and drive down dkh levels cant seem to keep dkh at optimal levels either..... thus affecting my ph which is also not at optimal levels. operation of reactor has my ph evening at 8 and ph morn 7.8. Higher dkh higher ph correct? magnesium levels do not know but am using kent sea salt . phosphate and silicate levels low, all life in aquarium healthy. tank not over loaded not over fed. Not getting maximum calcification or coralline growth.......very perplexing????