Help!!!!! 55 days into flowering and the plant looks to be dieing

if you can see the buds are starting to shrivel up and the leaves are turning yellow and very brittle. The only bugs that i can see are fruit flies, and i have already put up fly strips, top coated the soil with D.E. and have been water feeding the plants with molasses water... 400w hps, TGA supersoil, 4in inline, coconut filter, 4x2 grow tent, fox farms big bloom 4tbsp per gallon and they get fed twice a week. i have a co2 bag inside the tent, and i also have a co2 monitor that you can view on the http://starass.dumb1.com/rtv/rtv.html
i hope someone can help they still have another week before i would like to begin harvesting
this is a picture of my other plants, in the front we have NYC Diesel on the left and Purple Urkle on the right. In the back we have the Afgooey seed i found in a bag a while back (the plant that has problems) on the left, in the center green crack, and on the right another Afgooey, and in the middle of all that mess is a tiny Girl Scout Cookie seed i found a while back(She has her own problems... She has been stunted since growth and i stressed the piss out of her and she flowered and is growing more seeds). All plants are 55 days into flowering.
I hope that some can help me with my first problem though.... Thanks for any advice
Starass

so i think i figured out what might have been the problem.... fan timer wasn't staying on for some reason.. I will be watching it closely tomorrow on my day off, stay tuned for more pictures, these ladies are almost ready to get chopped, 8 weeks of flowering today

idk its your choice but i woul dkeep an eye on it and let the flower longer maybe another 2 weeks or so but i cant really teell from the pictures

i'll try to pull it out tomorrow and take some better pictures out of the light.... i'll actually try to post pictures of all 6 plants. Just got home from work before and the fan was off again and the temp was at like 86!!!!!!!!!!!!!! think it's time to go back to the old timer that never failed. But after i opened the tent it cooled down instantly. The plants are really starting to fill out and the nugs are dense. i do have some cross polination which i am kind of looking foward too. (Purple Urkle X GSC) (NYC Diesel X Green Crack) (NYC Diesel X Afgani) (Purple Urkle X Afgani) so this being my first grow i have run into many mistakes such as not getting the flowers off in time, but i am also looking foward to future grows with these feminized seeds

So i had to harvest i got some advice from one of my MMJ Dispensery guys, and he looked at my plants and was like it was time to harvest
ended up with 24oz wet so we shall see what dry weight is. Just ordered 12 auto seeds and am thinking about doing all 12 at once. Am i Crazy???