Alk??
Hey Shawn,
What salt are you using?? I've had problems with alk and the problem was the salt brand I was useing. If you have water made up, test the alk. I've had alk in freshly made water come out at 5 dkh. So no matter how much water you change, the alk is low. If it is low, buff it up with some alk buffer and then do your water changes. When your alk is low in your tank, remember to raise the alk slowly. You don't want to shock your corals. Hope that helps.