Just started dosing kalk via ATO. I'm using Seachem but I don't really have a preference. I tested last night and both alk and calc were low. It's been two weeks since a water change so it's time to start dosing to keep up with demand. I'd like to get the new pacific sun dosing system that comes out this month and start dosing 2 part + mag or balling method. The balling salts seems hard to find though.