So I just did a check on line and mg
/l basically converts direct to ppm
. So your 10 nitrates and 2 phosphates is 10 and 2 ppm
. Being as you have coral that isn't happy and what is listed above I say it's time for water changes. 300 calcium is low as is 5 KH
, combine that with your nitrates and phosphates and I think we have the answer. Calcium is ideal around 400-450, KH
should be 8-12, nitrates and phosphates ideally 0-0. What are you using for salt and what kind of water are you mixing it with?