NEED HELP PLEASE FIRST TIME GROWER

hi my plants arent doing so good, they keep getting yellow with brown spots, or basically overnight the leafs will turn crispy and almost black in some parts just dead, seems like most of the plants the bottom leafs are getting messed up, but my biggest plant is completely yellow with brown dots, the smaller ones are the ones with just the bottom leaves but each day that goes by it gets worse, i know some nights my humidifier runs out of water, not only bringing the humidity down but also causing the heat to go to high around 86-88f, im not sure if thats the main issue, maybe its happening more often then i realize as im not the only one taking care of these plants, we've done run off testing and there all in range of good ec from 400-600 and im using coco so my ph levels where all from 5.8-6.3 which should be correct, i feed them basic npk cal mag, and b vitamins that come from advance nutrition. just not sure what could be the issue please help if you can thanks. first time grower.

What lights are you using? Depending on the lights used the temps might be high. Might not be high.

I'm a soil grower but I do believe your pH needs to be under 6.0 for coco.

How often do you water? Are you feeding with every water?

Got any pics of the plants?

hi there, thanks for the response, I use two tsw 2000 from mars hydro there both 300 true watts so around 600w for my 4x4 tent which from what im told should be more then enough, i im watering them every other day, i was told its better to do everyday but it just seems way to much like when i go to water again the next day its still fairly wet, but if i wait and do it every other day i can see the top starting to get dry, i was feeding so i would use nuts then not then use nuts, its all very new to me so im trying to find the balance, it would be nice if i understood what the plants are trying to tell me, but diagnosing is tough very tricky.

these as well