Possible over watering and MG or CAL deficiency need expert opinion

hey looking for some opinion and help to find whats wrong with my lady's i think it might be over watering and Mg or Cal deficiency but not sure, The leafs are curling down and there are some kind of discoloration of the older leafs, im groing WW Big bud, and blue cheese in soil 5 gal buckets, indoor with 600 w MH, i topped a couple of branches feed RO water and then the problem started, there are some pics for better reference, hope to get some feed back.

i have the same problem except my leaves are curling up!

Your soil is MG? What kind of food are you using? How's the temps? With 5 gal pots I found it easy to overwater, so make sure you have good drainage. RO water can lead to cal/mag deficiency, do you use any? Do all your lower leaves have the same discoloration on all your plants? How are the temps and the humidity, because the plants look a little hot. I think that maybe there might more than 1 problem, but need more info. Good luck

hey looking for some opinion and help to find whats wrong with my lady's

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have the same problem except my leaves are curling up!

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You both have heat issues . Get a peak memory thermometer to find out how hot its getting.