Calcium Reactor/ kalk reactor

If my calcium is high in my tank would I even have to get a reactor to dose calcium/kalk? I do have liquid calcium that I have to dose but I dont use it cause my calcium is reading in the 600 range cause of the reef crystals.... 

 

I have about 15 sps frags in my tank they have been in there for a month with little to some growth but not a whole lot I add mag. should they be growing faster or do they grow really slow.... I have 2 ora birdsnest, 2 green milli, 1 orange milli, reverse superman, bonsia, valida, purple cap, green cap, red cap, galaxia coral, trumpet, candycane thats for sps and lps

 

I dont know alk and mag params yet I ordered the test kits for them just waiting for them to get here.... /DesktopModules/ActiveForums/themes/_default//emoticons/sad.gif