I would grab some kent super dkh to raise your dkh to around 8-12. When you raise that it will lower your calcium (cause it is a little high right now) and then use a two part solution (like b-ionic, two little fishies, ect, ect) to maintain calcium and dkh. I have tried almost ever two part out there and like B-IONIC best. I use it on my 180 SPS reef and works great. I would rather have a calcium reactor but do not want to worry about it all the time.