You pick the change poll

[Delphinus]

Also from back when I did run a reactor for Ca and Alk, I found that Mg just worked out to where it needed to be.

I've been kind of thinking actually of putting a Ca reactor back online on my tank. When I look back I always had way better SPS growth on tanks with them than without them. I just don't cherish the thought of needing to refill CO2 tanks every few months (which for me was sort of the ultimate push away from a reactor in the first place). I wonder though, if one could just just keep the Ca and Alk dosing and have a small reactor as a kind of supplementary measure and then it's not as big a deal to take the reactor offline for a week to get a tank refilled or whatever.