Hi,
Not exactly what I meant. I meant that you should maintain your current water change schedule...if it's working and you don't have a nitrate issue(which is seperate than balancing the water chemistry). Before dosing you should see where you are at for Ca/Alk/Mg....these three must be in correct porportion or you won't be able to keep Ca or PH up. Right now your calcium is low, it may be held low because mg levels are off...could be but you won't know unless you make sure mg is ok (~1350-1400 ppm or roughly x3 calcium ). So get all three of these in-line starting with magnesium(no more than 100ppm daily) then wait a day to see where your levels are at. If needed bring up Ca/Alk(slowly) and check levels the next day ( PH may take 48hrs to fully stabilize but you will see pretty quick if it's changing). Once your levels are balanced PH should fall in-line. Monitor weekly to see if/how much your levels are decreasing, if you do weekly water changes then retest after the water change to see if there was any impact, then dose if necessary. Hope that's a lil' clearer.
Cheers,