First DWC T5 SOG Grape ape Grow

Hello,
This is my first grow ever, I decided to post some pictures to show how the progress is going. I built a 4.5'x2.5'x4' grow chamber, decided to go with a SOG setup in DWC in order to shorten times between harvest. I have in this setup:

Veg:

8 Lamp T5HO - 6x 6500k AGRO & 2x 5400K Agro Veg lights
3x 14 gallon Rubbermaid Brute totes
3.75" net pots
951 Gal/hr Air pump
2 Airstones per tub
8" Duct fan exhaust
AC Unit
Dyna-Gro Nutrients
Arrowhead Distilled water




I transplanted 24 Dark Heart Nursery Grape Ape clones rooted in rockwool from my local dispensary last Saturday. I added about a 25% strength of Dyna-Gro nutrients to the DWC according to their website's Non-recirculating schedule:
Grow 7-9-5 - 1/8 TSP per/ Gal
Mag-Pro 2-15-4 - 1/16 TSP per/ Gal
Pro-TeKt 0-0-3 - 1/8 TSP per/ Gal


PH was 5.6-5.9
PPM's were 90-100
Air temperature is 77-81 degrees during the day, 66 degree's at night
Humidity fluctuates 36-65% during the day and night
water temperatures 66-69 degrees F.

A day after transplanting I realized that I probably over-watered them since they were getting a little droopy and the rockwool was completely soaked, I lowered the water and allowed them to dry out for a couple days.



Finally after the rockwool cubes were visibly dry, I raised the water level so the bottom of the net pots would be misted the airstone bubbling. I also lightly top fed them in order to keep them from drying out.
One day later I can see a bit of new growth and the roots seem to be growing down out the rockwool cube through the Hydroton pellets. I estimate that by tomorrow night the roots should be poking through the net pots.



I am a little worried about the plants, They still seem a little droopy. Some of the leaves are slightly yellow, the very tips of a couple leaves have turned brown.


I should mention that I have not calibrated my PH tester yet, tomorrow I'm gonna go to the hydro store and get some calibration liquid. My Bottled Arrowhead Distilled water reads 5.9 PH on the tester so I believe it is properly calibrated.
What do you guys think? Do my plants look ok?
 


Upped the nutes dosage to 125ppm, 170ppm & 130ppm for each 3 bins.
I also noticed that the very tips of some of the roots have turned a little brown, In my bins the water level was a good 2 inches below the pots and some of the pots were not getting a lot of water splashed up into the roots. I believe the brown is caused by excessive drying and oxygen to the tips but I cant say for sure.


After looking at the pics closer I realized that the tips of a lot of the leaves including new growth were turning brown.


 

Today's updates,
Temps today were 63 during night cycle, 79 degree's F during day cycle.
Plants look about the same as yesterday but there is more and more root growth everyday.
I have heard that the stems of plants will turn red or purple if it gets cold, but I am not sure if this is the case as my temps dont go below 60 degrees F ever.
Water temps are 66-69 degree's during dark cycle, they might be getting pretty cold during the night cycle but I doubt this is causing an issue since the roots are just now barely reaching the water.
 
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