NM, look into the Korallin 1502, I like them and use one myself. They won't let your pH get out of control like others, they will shut themselves down. If you don't drip kalkwater already, I'd say do that first, it seems to me kalk is better if you're going to do one or the other. My CA reactor isn't all that efficient at raising CA, more alkalinity though, it raises ALK very well.
Golfish, that sucks.