I presented this same question to an chemist,It should what I was told work pretty good on a reef tank your size.I would monitor the calcium levels and the alk and the ph really close,andgo from there.But I was told on a small reef it can work.
I used it on a 3o gallon reef and had pretty decent results,but it was hard to keep things......on a consant level.I had to actually try other things to keep the calcium and alk up to what they should be. As your demand rises for calcium the effectiveness of this is greatly reduced.So to be honest I would use something else.
David