Do you have a pH pen? Where do you get your water? I think I would flush with some ph'd water then I would go with 500-600ppms let her come back. But with out know how many ppms your feeding them and what the pH is its hard to know if its lock out from pH swing or you are truly deficient in something. My bet would be pH cause An works pretty well with photos. I have never have a cal/mag issue with photo's, auto yes. Most the time its my water or medium that's messing with my ph, causing lockouts.