Alaskan Purple Auto

We've got another week in the books. A week of heavy learning too. Last week she was fed the recommended dosage for mid veg, but after a slurry test I'm seeing that she does not want that much food. Yesterday was a tea day so I'll give the colony another day or two and retest PPM so I can adjust her feeds from there. I'm seeing a mag deficiency so I'm going to need to nail down the source sooner rather than later. Could it be the heavy feed locking it out? Could it be the fact that my tap is 260 ppm (.7 scale) and calcium bicarbonate is binding to the nutrients? Only time will tell.