clones on rockwool slabs not growing

about 2 weeks ago i had clones that were in 3 " cubes. the roots started to show and i put them on slabs. i watered them everyday with GH maxi grow 300 ppm. the cubes just collected alot of green fungus and the clones havent done anythimng for 2 weeks. roots are browning. leaves dull green with red veins. what do i do??? i cut back watering and have seen new white roots developing so what do i do now ??water less, stop watering, water constantly???
What is your experience level? novice,

What type of hydro set-up are you running? rockwool slabs, top drip

Your Equipment:
A) Type and wattage of lights. 1000w hps
B) Distance from tops? 2 feet
C) Reflector type? wing, .)
D) What are the bulb wattages, kelvin ratings, and schedule?
E) Is there a consistent fresh air supply? yes
F) Do you have an exhaust fan and a circulation fan? yes
G) Size of reservoir? 20 gallon
H) What medium if applicable. rockwool

Your nutrients and water:
I) If using rockwoll for clones or seedlings, did you rinse the cubes well, with properly ph'd water? yes
J) Source of water. (tap or filtered) What's it's ph? filtred 7.0
K) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
L) What is the ec/ppm of your unadjusted tap (or filtered) water? 0
M) What is the ec/ppm of your nutrient solution? 500 ppm
N) What is the temperature of your nutrient solution? (reservoir high and low temps) 70
O) Does your ec/ppm show a rise or fall when you do your daily PPM check?
noQ) Do you foliar feedso, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...) no
R) How often do you replace reservoir water/nutes? What does it look like before changes? (clear, foamy, green, brown...) once a week

Your growroom:
S) What size of closet, room or hut? room
T) What are the temps and humidity levels while lights are on? 78 low humidity ...With lights off? 75
U) Have you seen signs of insects in the growroom? no
V) Are the roots long and white, or brown and slimy? brown

Your strain:
W) What strain are you growing? (Indica dominate or Sativa dom?) both
X) From seeds or clones? clone

Are you talking about the same plants in this thread as the other???

CGI::::::

this thread is the slabs. i also have a 5 gallon deep water culture system with 6 buckets. thats the other post