needing advice soon plz!!! thank you!!

i have a white widow x big bud and liberty haze that is a month and half old they getting rust spots and dying leaf tip/ ridges on them and im not sure what the problem is it started from the bottom up now little rust spots are all over the plant all the way to the top.. im using fox farm OF soil and the fox farm trio nutes ph'd at 6.8...im putting 3 tsp of big bloom and 2 tsp of tiger bloom and just added cal mag plus 1 tsp .. i have a 400watt MH about 2 foot above the plants ...air circulation temps range from 77- 84 f... 12/12 light ...i included some pics of the WWxBB if you could please help me b4 the plant dies...THANK YOU



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you think so? what should my ph be to get the mag in there? the calmag is new and last feed was the first time i used it and seem to get worse?
 
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