You are way beyond massively over lit! one of those lights would have been more than enough. You're at 35,000 lumens per sq ft!!! There isn't even a word fo that.
I'm not trying to bust on ya here, but you bit off waaay to much for your first grow. That's the whole learning curve in a nut shell. Trying to figure your nutes out, Watering and feeding schedules, pH adjusting and on and on...
Even a first grow with a new set up, by an experienced grower, needs to be test ran before it's taken to an extreme.
Most of your questions are basic "grow guide" questions. The type of thing you needed to know before you started. It's kind of like a fishing reel with the line all twisted up. It's a little late to be learning the basics now.
Too many plants, too little room, too much light, too little nute experience. Plants are torched during flower (probably by both the lights and the nutes), temps are too low. The R/H is probably too low........... Are those plants seperated in the box so they can be removed without pulling them up? I hope so.
Wow...Really, I'm not trying to sound off. I feel bad for ya. But your in deep right now. It's like everything that can be wrong....IS. At this point, it's kinda like trying to turn around while running full speed down a muddy hill.
I don't even know what to say, except to thin the herd. Tie the ones you keep down. Flush them out well (if you even can). Center a light and use only one. (One 1000W HPS will give you 140,000 lumens and cover a little more than 18.5 sq. ft.) Get a space heater or two, and get your temps up to the low 70s at least. There's no perfect nute, until you know what to do with them. Spend a few nights reading your a** off, and see if you can save any.
You said you started flowering on "May" 1st??? Did you mean March???
Is your grow room oustside in the cold with no insulation? Four 1000W lights are only making that area 68 degrees? Good Luck
