acan problem pls help need advice

[lReef lKeeper]

your mag. is way too low.you will need to slowly bring it up to 1300 or so.i struggle to keep mine up to 1200. i dose 2table spoons of mag. everyday.some people don't like to dose mag. everyday. just do not over correct, it will stress already stressed corals.
-chris

I agree ... Mag is way low. Could be the whole problem when paired with the nitrate issues. Correct them and I bet you see a major difference in your corals.