Healthy or Not?

Sorry for the picture quality.

Plants in first pictures are TGA QUSH
http://i.imgur.com/qhv0lsM.jpg
http://i.imgur.com/q83LiZ3.jpg
http://i.imgur.com/T6z6Mun.jpg
http://i.imgur.com/i9cu9Va.jpg
How do they look? Im still trying to find the best strength of nuet to give them.
They will get yellowing leaves but some of them are very dark green.

The 6in tubing we are growing the plants in is thin-ish, so the roots get little light.
Will this keep the roots from growing?
Also algae is starting to build on the rockwool. Can this cause an issue?
http://i.imgur.com/eGHZOX4.jpg
http://i.imgur.com/hdPJSh5.jpg

Gods Gift
http://i.imgur.com/mRsdvST.jpg

113 views and no help?

Maybe more info will help:
2 rooms 5k hps each in cool tubes.
Both rooms have an A/C
they are growing in a topfeed/NFTsystem
the reservoirs are dug into the ground outside the rooms so they stay pretty cool.
I use GH maxi bloom power. Lucas formula with tap water.
I also use silica powder.
I always try to keep PH at 5.8. once in a while it will go up to 6.0 or down to 5.5.
Just installed 2 A/Cs last week...
room temps very 80-95f through out the day. with A/C on!
Biggest problem i think is HEAT.
Qush in room 1 are getting CO2
Gods Gift in room 2 are not. I am working on getting it though.
Both rooms have a lot of air circulation.

4 days and still no help?

I run my babies at 85-to 90F without issues. Im not pro at all but the first thing that spring into my mind is the algae. Also if the tubes are thin who knows what else is in the water besides algae. Did you consider adding h2o2 to your reservoir? Next the water supply. You say its cold.. To my humble knowledge cold water can chock the roots. Are you adding any cal-mag to your water? (Sorry UB )

The temps are too high for your setup. The leaves look heat stressed.

How could you have 90 degree temps with an AC? AND cool tubes?

Are you exhausting the hot air from the room? Do you have a fresh air intake? Something is definitely off with your environment.

Were you attempting a scrog? Or is that just to support the branches.

thats just there for support.
yes the tube lights have a fresh air intake and it is blown out of the room.
we just bought 2 12k btu A/Cs to replace the 6k ones to see if this helps with the heat.
here is a layout of the room

the 12k btu A/Cs are barely doing the job. lowest i can get the room is 85f.