Need Some Help PLEASE!!!!

Hello I am having some trouble with this go round. My lower leaves started getting some really bad brown spots on them that look like burnt spots. They also have some holes in the leaves arond these brown spots. Ok here is my info.......
1. Indoor/Cabinet
2. Soil/Promix HP
3. Soil ph/ 6.8
4. Water/ Tap water
5. Water ph/6.8
6. Age/ 4 weeks
7. Nutes/ GH Flora Series Grow, Micro, Bloom. Also using hygrozyme and a drop of superthrive.
8. Feeding Schedule/ Per GH Schedule
9. Lighting/ 400W MH Hortolux in a 24" cooltube 10" away from plants.
10. Temps/ 76 day 60 night
11. Humid./ 50%
12. Light Schedule/ 18-6
13. Ventalation/ Dayton blower 600cfm incoming. And 2 4" can fans doing the exhaust. The cool tube uses 2 6" duct boosters that work awesome. The cabinet is completly controlled with a enviromental controller.

Anyone who could kinda help me out with this i would be so grateful. Thanks in advance
NEMF 2000 :)

Your plants say BRRRRR!!!
They want to be 65 minimum night, and 78 day. Cold wet roots = sad droopy plants. Plus being on the floor- if the floor is cold, you might have even COLDER roots! Is that a cellar floor? Brrrrr you need to get them on something quick!
The other thing is that those grow bags don't always drain that great, and if you prop them up off the floor on a milk crate, not only will the chill from the concrete not get to them, but they will drain more freely.
Be careful with the superthrive because you look right on the verge of a nitrogen overdose. It's very N rich.

thanks attic ! so you are saying the spots and holes in the leaves are from the cold or from to much N ? I actually just put them in these bags lastnight and they were only on the floor for the pic the are in a wooden cab. with a floor. Thanks again. :)

The spots don't conform to any specific nute problem I can think of offhand but it's the DROOP that worries me about the cold, and cold can cause nutrient lockouts and spotting.

I was thinking maybe a P Diff.? I have 5 girls this one is by far the worst! I took care of the day and night temps so lets see what happens from there. I was also thinking maybe its the pro mix i have never used the promix hp before i have always used the bx and never had a problem. Thanks again attic your time is truely appreciated!!

These pics are 10 days from last pics. They seem to be doing much better i dropped the flora grow last feeding and only used the micro, and the bloom. I also dropped back to 1/4 strength on nutes. let me know what you think?:)

Looking MUCH better.
I've never used the HP either; I am just starting to play around with the BX myself. Just a note- cold wet soils lead to MUCH stronger symptoms of non-ideal soil chemistry than warmer, dryer, lighter soils do. Keeping environmental conditions close to ideal saves you headaches in the long run.