Need help plz!!! First DWC grow leaves curling/turning brown/rust color

Hi all im new here......currently on my first grow and it was going well besides my cats attacking a few leafs heh but they didnt seem to bother it much. My issue now is im on the 4th day of flowering and it seems now im getting spots on my leafs that are drying out and are crusty. The leafs are also curling down im not sure whats going on and im freaking out!!! Im using the 3 part GH flora series nutrients, have a 400 watt hps light, have 2 6500k cfl veg lights, 2 2700k bloom lights, an exhaust, carbon filter, portable ac, the works pretty good setup. The temp is running about 66 -71F thats with lights on and off and the resivoir temp is 68-69F just have no clue whats going on, ive done some research and seem similar problems but figured it would be best to post my personal problem/pictures here and hopefully can get the problem fixed asap, any help would be greatly appreciated thanks!!!

P.S. if anymore info is needed please let me know

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243 views no help heh? Will try elsewhere I guess thx neways.

Whats your PH at?

I need to buy a ph pen using drops at the moment but it is usuallu a yellow to yellow/orange color

I did put some ph down in thinking maybe it was a tad high, seems people with hydro run the ph lower I was just following what the ph test kit said saying yellow to yellowish orange was idea for plant growth but probably referred to soil. I noticed the plant did seem to perk up a tad bit in some areas, I have a hour and a half to go till lights on and hopefully it looks alot better but will see.....anything else that might be causing those issues besides ph? I have been using anywhere form 1/4 to 1/2 the recommended nutrient dosage and once I started flowering I switched it up to the normal recommendations for blooming which was 4ml of gro, 5ml of micro, and 5ml of bloom per gallon. Looking forward to your and others replies for help, thanks so far.

Ok the drooping stopped, im guessing it was ph, gonna go get a ph pen tomaro, but would ph also cause the rusty/brownish/crusty leafs to that are in the pictures? Or is there something else going on there, also what is the best ph range for a dwc? If someone could answer those last few questions should be good to go, thanks.

DWC veg is best at 5.8-6 DWC flower is best at 5.5-5.8

Other issue could be too many nutes. I get brown spots when I use too much superthrive in veg stage

Thx for replies bro.....atleast you tried to help, I need to find a more active site in future heh