Looks great man! I love photos, just now trying out these auto things haha.. I am wondering how you get in there to water without being able to remove the pots? Do the plants sit in the run off water? If so, the salts that would normally get flushed out are reabsorbed by the plant. That might be part of your cal/mag issue. Just something to think about, keep up the good work! That room is going to be full of buds before you know it!