Please Help

This is the second plant that I have had droop like this. I removed the first and larger plant from the garden because I thought is was Fusarium or Verticillium wilt. I cleaned my NFT system and started over and now again, aproximately 4 weeks from seed, it begins to wilt . The roots are still white but seem to be covered in a gooey milkey muccus and clumping together. Is this algea? The canopy temp stays between 75 and 80 deg. The resevior temp stays between 65 and 70 deg. I am using (1) 300w MH bulb and (1) 400w HPS. There is good ventilation, i am adding co2 per the simple sugar, water, and yeast set up, and there is a small oscilating fan keeping the air mobile. I am using nutrient solution from Stealth Hydro "Grow" and my Ph stays between 6.0-6.5 What is the problem? Can I save the plant?
The bigger plant in the pictures no longer exists, R.I.P. however; the smaller plant had its photo's taken minutes ago!

I think it is having trouble seeing the light. its way to far away. You should be able to put a 400watt hid a foot above your plant if you have good ventilation. Remember the inverse square rule? Good cause I don't. Slimy roots can be a sign of oxygen starvation. I found a foot long air stone at Miejers in the pet department for $1.99.

Thanks, i appreciate the ideas but I have a 300w MH light aprox 3-6 inches away (i pulled it up for the pic) and I have an airstone in the resevoir.

Wow, everything sounds like it's in perfect range. The slimey roots are the result of something wrong with the res, and usually res problems are caused by res temps being above 75. Has the res temp ever been that warm?

Hydrogen Peroxide, or products like GH FloraGuard or Botanicare HydroGuard can be added to try to clear it up.

HTH

Thanks for the input, i think your right. My res temp is below 70 and closer to 65 deg however, i think the trays are cooking the water.

potroast is right temps over 70 deg are usually to blame for fusarium,and the hydrogen peroxide will kill germs on the roots but mix it at a 7:1 ratio with water