I decided to go a different direction than all for reef. I’m not really using cal or Alk beyond what a weekly water change can replenish. I don’t have any SPS. Where I need a little adjustment is trace elements. I decided to get the small package of red sea ABCD and I’m going to dabble with that for a while. It much less $$ than buying the individual bottles of trace elements from ATI when most of it would just go to waste. If I see a positive reaction then I’ll keep using it and if not it’s only 20 bucks.Let us know how the a4r conversion goes. I am about a week into mine and after a bit of a spike found that 4ml per day seems to hold my alk steady. Tonight’s test will confirm.