Hey guys, I’m a first time grower and I’ve got 2 White Widows (pictured left and middle) and one random seed (pictured right) and they’re in their 5th week of flower. There are obvious discolorations in multiple leaves on the White Widows, but not too much on the random seed. I’ve convinced myself that it is a calcium deficiency, so I’ve been feeding the plant Liquid CalMag every other feeding as directed by the manufacturer, and I began giving the plants CalMag when I flipped them to 12-12. The discoloring has progressively gotten worse, but the bud production has been good from what I can tell. Can anyone tell me if there is anything else I can do or am I worrying too much? Thanks everyone!
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Beautiful plants. I’m a noob myself. But looks like nute burn in my opinion… hopefully an experienced grower can pop on here and actually help you though.
Thanks man, they’re so close! I’d hate to ruin them now 
Nice looking plants,lots of Frost. You mentioned already using Cal Mag my next step would be get a runoff and check my pH And adjust accordingly .And also check ppm runoff.
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try organic bone meal
This is before and after bone meal it said 2 tbl spns that wasnt enough its very mild so I put about 1/4 cup per plant in 15 gall pots
what kind of light are you using
Yes. It looks like calcium deficiency.
Keep in mind that damaged leaves will not recover. Look at new growth.
Runoff ppms and pH could help dx.
So will a support ticket. 
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1 BLOOMSPECT 600W LED and 1 GalaxyHydro 300W LED in a 4x2x5 tent
at 5’ tall i assume your light is close to the top of the plants, you maybe getting some light burn
i found this to be a real good read
That’s a possibility. I will say that they are both at the height that is recommended by the manufacturer.