wilting/curling brownish leaves

i tried making "homemade Co2" which is a plastic bottle that has a water, sugar, and yeast mixture in it. The concoction bubbles at the top and displaces a yeasty aroma after shaken vigorously. I placed two of these bottles in my room (which is at least 6'x8'x8') under a 1000 watt HPS. there are 5 plants total and they are 4 weeks into flowering. Today two of the plants have leaves curling downwards at the tips and wilting, there is also brownish streaks horizontal on these leaves. I watered the plants and they took in about one half of what they usually would, the trays beneath them are filled to the top with the excess water. Sorry for no pictures, i will try but dont own a fancy camera, if you have any ideas please reply

sorry i couldnt put the pics all on one post

come on guys, one reply please?

Hey man cant see pics but if it helps any, I dont think the Co2 bottles would cause this.
Probly to much nutes, If your usein any maybe cut back, and what type of system?whats your ph?whats your PPM?

well thats shitty i guess you cant see the pics, i don use much nutes at all, and for the ph and ppm, i dont know.
i use ff tiger bloom about 3 tea. per two gallons, i havent given them any in about three days, all other plants look fine and this one is basically dying now
like i said i have a 1000w hps in a semi big area with 5 plants, 3 GDP, 1 supergirl, and 1 NYC Diesel in 5 gallon pots(soil is ff ocean forest), the one dying WAS my plumpest gdp, im kinda pissed lol, i have a vortex fan that is being used as anintake and there are two other oscillating fans blowing on the plants

Never mind about PPM then, u should really get a ph tester though, could be ur problem might be locked out or sumthin.

this would be a alot simpler if i had pics i bet....

the plant is now an outside plant i guess cause it is cooler and the fresh air, every leaf is curled and wilted downward and are brown, about half the bud sites are turning brown too....

this ph tester, from where?

U can pick one up at ur local walmart, or hydro shop.U can get them with a moisture meter too, makes to easy to figure out how fast ur soil drys out.
Were u leting your soil get completly dry before watering?

like an inch an half deep i would feel and it would be dry

U want it Bone dry before each watering.