Take a guess at one of my many problems or questions

I'm growing in pro-mix ultimate organic and I just switched from a 90 watt led to a 240 watt led, and am using roots organic nutrients. The plants vegged for about two months (they are all autos) and they have been flowering for about five weeks. One of my plant's leaves are folding upward and the edges are brown and the leaves at the top have twisted pretty badly and I'm guessing its a magnesium deficiency, but it could be a ph problem. On my most resinous plant all of the fan leaves have fallen off and the tips of the leaves have turned yellow and started to curl, and the edges have started to become yellow. Another one of my plants top leaves are also slowly turning yellow.
Anyway take a look and tell me what you think, any feedback would be appreciated.
 

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