I second alk stability. I use to dose two part for my 700 gal an had episode of alk levels dropping below 8 several times. This caused RTN from the base up on most of my corals. Over weeks I tried to fight it but the only thing I could do was frag out the corals and that didn't work with all of them. I bought a commercial grade Geo Calc reactor to stabilize. I can not stress enough having stable Alk.
Agreed, I am currently trying to figure out how much alk I need to does a day. I havent had a drop yet because I only have about 9 frags in a 280gal system but I am watching it close.



