Hello All, let’s get straight to it. I’ll preface this with saying I appreciate anyone who takes the time to go over all this and provide feedback.

Equipment & Setup:

120L Coleman Cooler (30 gallon capacity to bottom of net pots)
TrolMaster Climate Controller and Sensors
BlueLab Guardian PH/PPM/
6x 3” Net Pots
160LPM worth of air pumped
8 air stones, 2 air discs
400cfm CanFan and Filter
12k BTU AC Unit
Scrog net 4x5
Gorilla Tent 5x5
Growers Choice Roi720 LED Light


Conditions & Data:

Ambient Temperature: 75-80f
Relative Humidity: 30-40%
Water Temp: Never above 68
PH 5.6-6.1
PPM 100-300
Sterile System

Nutrients:

Advanced Nutrients Sensi Grow
Bonticare Cal-Mag
General Hydro PH up and down
General Hydro Rapid Start
H202

Water Source: RO consisting of 5-10ppm, ph around 6

Medium:
RockWool and Hydroton

I purchased 6 clones from a local dispensary.

I rinsed the hydroton in a large net pot until water was clear running off.

I placed clones rooted in rockwool, directly into the bottom of the net pots.

I filled the 3” net pots with the clay pebbles and covered the top of the net pot with reflective tape.

The water level initial was just at the bottom of the net pot. Maybe 1” below. PPM at 150 and PH starting at 5.6, daily it would rise for the first 10 days to 6.3 in 24 hours and I would lower back to 5.6 with ph down.

During this time the PPM was also rising by about 10 per day. So I decided to do a Res Change. Not knowing If the PPM and PH rising together (slowly &controllable) was due to an underlying issue or due to the clones still rooting.

This res change is lowered the PPM to 100 and started with a PH of 5.6 again.


Within 10 days all but one of the clones had roots out of the bottom of the net pots and into the water. They were looking fantastic and really starting to take off at this point. 3 of the 6 were double the size of the smaller struggling clone.

At this point I lowered the water level to about 2-3” below the net pots. Like I normally do.

Shortly after this, all the roots that were above the water line began to have a grey hue to them. All the roots below the water line were sparkly white and normal.

Within a day or two, and seeing no improvement with the grey. I decided to raise the water line back up because I had come across information that made it seem as though it may not be needed, to have the air gap.

Everything continued well for a few days , tons of growth each day. As the PPM dropped little by little, I slowly got to the point of 300PPMs and the PH stays steady at 5.8 I do not need to adjust it at all currently.

Since 3 of the plants were growing at a much more rapid pace than the others, I decided to top them at around the 4th-5th nodes, and I tied them down LST slightly to allow the others plants to catch up.

For the week remaining after this everything has gone to shit.

I have seen no growth.
The roots have grey matter throughout now. This grey matter is hard to get out, the roots have grown around it. It almost looks like some tube of grey fiber looking material.
Tons of leaves are dying. The plants are wrinkled and looks like your hands when your in the pool for 6 hours. The are curling downward, They have brown spots, yellowing, purple stems. Damn near everything.

Last night I ripped the smallest girl out to inspect for mold or damage.
Everything honestly looked fine to me except for one thing. The Rockwool was drenched. I mean I squeezed of way more than I would have ever though that a cube could hold.

the root development on a plant that was nearly 3 weeks old is pretty sad.

I think raised my water level again after the plants had rooted essentially suffocated them?

Can anyone point out anything else that I should tighten up?

I appreciate you all taking the time to read that long post