Yep, I've been working on Ca and Alk for the past month. I'm using aragocrete and reef rock and using that one piece to seed them so I had to. Just an experiment. I'm going to add some more liverock, though, I want some purple in there, and I'm making more aragocrete.
Here's a closeup of just how nasty that rock was. All I did to clean it was siphon the substrate clean once a week.
