When posting to this section, please make sure to include the basic information with your post... how long the system has been setup, any recent "events" which may be causing issues, and at a bare minimum, your water quality readings. Salinity, Ammonia, Nitrite, Nitrate, Phosphate, Alkalinity, Calcium, Magnesium get you a better understanding of many underlying problems.
For example:
From this, we can see your Alk is high, and Mg is low, and calcium is on the low end.