beluga said:

I'm a little stumped, personally... never done DWC, but you might be correct in that they aren't getting enough oxygen to their roots.
Strictly speculating, you might want to lower the water level and/or provide a more air with a more powerful pump or efficient stones.

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Milson said:

What happens if air temps go up to 77 or so?

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Lynch_Ironside said:

I have the mother of all air pumps on stand by. Can you give too much o2? According to @Aqua Man it's not about how much air but how much water disruption/ circulation. I now have 4 stones, two at 4x2 and two at 12x1. I know this doesn't increase the amount of air pumped but rather improves the disruption.

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Lynch_Ironside said:

@beluga I thought you were running a dwc for those monsters under that badass light you built?

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beluga said:

I seem to believe... so long as they are not allowed to dry out, the more air, the better.
I leave my young plants suspended far above their water source and cut off that water source for 30-minute intervals every 2 hours. It seems to work both for cloning and for growing. I usually see my plants start vegging again in ~10 days after taking clones.

It's low-pressure aeroponic and then kind of a hybrid once they get their roots deep in the reservoir.
Once they're not on a tightrope about to fall over, I'll pop open the lid and snap a pic.

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Aqua Man said:

Let's see a pic if the roots... and start from scratch. It's not lack of o2 they are far to small to deplete it to a level that would cause issues.

Water temp?
Air temos day/night?
Circulation fans?
Source water?
Nutrients used and any additives?
Humidity day and night?
Are you running live or sterile?
Ph and ph drift over 24 hrs?

Pics of the roots?

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beluga said:

I seem to believe... so long as they are not allowed to dry out, the more air, the better.
I leave my young plants suspended far above their water source and cut off that water source for 30-minute intervals every 2 hours. It seems to work both for cloning and for growing. I usually see my plants start vegging again in ~10 days after taking clones.

It's low-pressure aeroponic and then kind of a hybrid once they get their roots deep in the reservoir.
Once they're not on a tightrope about to fall over, I'll pop open the lid and snap a pic.

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Aqua Man said:

Any slime on the roots or smell of decay

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Lynch_Ironside said:

Temps are pretty consistent,
water is around 70
Air 72 ish
I have a 12" fan on low oscillating and an air exchange that was set to do a complete turnover 13 times a min
Source is ro at 0ppm
Humidity is consistent 45 to 50
Running souther ag fungicide at .5ml per 10 gallons
Ph drift is minimal at .1 to.15 per day
250 watt mh they are getting about 13k lux now with the height they've put on

I've over watered plants before and this looks like its exhibiting the same symptoms.
At first it was just the bottom leaves but it seems to be traveling up the plant.

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Aqua Man said:

With RO you want to add cal mag back. Are you doing this?

You need a slight breeze through the plants. Enought to make the leaves wiggle. The hydroton area is very high humidity and you need to push the air coming out of there away from the plant. If you look at the base of the stem do you see white little nubs?

Roots look ok. But raise the waterline to 1 inch below the netpot. At this point you could even raise up to the net pot.

There is no such thing as overwatering... overwatering is lack of o2. Roots will grow fully submerged with no issue if the water has adequate o2. In soil this happens because when its to wet there is not enough has exchange.

This is a transpiration issue. I would remove the leaves resting on the lid. It will help open up airflow and they are not going to transpire well and die anyhow.

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