Dang. I use Randy's/BRS2 part recipe and normally just check alk to make sure all is good. Lesson being to test calcium every so often too! Alk at 7, calcium at 300! Brought it up to 450, now need to see if maybe I didn't make the calcium correctly this time or if the doser is off. Not noticed any trouble in the tank, the huge coco worm even put down some new material, but happy to catch it.