Hello. I'm having a bit of a battle atm with my plants. since day 7 I've been getting rusty spots and its now happening on new leafs and its day 21.. I was feeding them calmag, advanced nutrients sensi grow A&B, carboload and voodoo juice. I noticed a N tox due to the calmag having a lot of N in it so I've flushed them and going to stop using calmag until later on in flower. Can anyone tell me what the problem is please? PH is 6.0 after nutrients have been added and run off is around the same could be a little lower but I only have test strips.