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Since I did see that fly in the chamber this morning... and did remember seeing it before,, it makes sense that this type of biological attack could occur and by-pass UV measures in place to keep algae and fungus under control. Also of interest that the same death scenario played out with the...

Just looked up what DWC means. I have done several without incident and have built several chambers to do so. It's just been the past few that have had this problem. I now have a simple 5 gallon bucket with ~4 gallons water. Last plant that looked like this I terminate, planted in my garden, and...

I have killed a plant before by submerging the entire root struct (ie rock wool cube) under the water. That is why I've adjusted the level in the pail to the bottom of the rock wool.

may be the lighting in the pictures, but roots actually look way more white than brown. All water adds are RO water clear of pathogens. Water is circulated through an intense UV light chamber at around 1 gal/min. The 4 gallons in the pail see the UV about every 4 minutes. Water is crystal clear...

was keeping the cube out of the water as to not drown the plant..(thought this was causing the leaves to droop and brown at the end (earlier on) I'll raise the water level.

did see this single tiny fly buzzing about

Light was ~30" above prior to lowering it. Air temp in chamber has been around 72F-77F. Currently pH-5.68 @67.2F, 247-ORP, 432-TDS. Chamber 75.2F. 50% RH. Wool is saturated as I dropper water onto it as well as effervescence from the air bubbling into the water below.

an hour after adjusting pH 5.35 ,, 442 TDS. pH will probably stabilize at ~5.7 +/- 0.1

Overnight numbers settled to 6.05 pH, and 414 TDS... 1.0ml pH Down added... 5.30,,,445. pH will continue to creep... probably head back to 5.6 to5.7. No soil was used in this grow. If soil born root maggots of some sort, I can examine under microscope.

PH now 5.65, TDS 434

Based on the first advice I began moving it up... currently 6.37, TDS=815. I'll start moving it back to the acid side. pH meter is one of those multiple measurement device.. sensor hangs down in my grow bucket. pH correlates well with a color indicator test I use for my swim spa. The rockwool...

So 6.2 pH is too low ?? I thought that level allowed for most nutriments to be available for absorption.

This is my second recent grow that looks like it's dying at three weeks. Probably at the development of leaf set six to seven. Hydroponic grow. pH 5.7 to 6.3,, TDS 958,, water temp 67.5F. +/- 2.0F, relative humidity ~50%, fan ON low, light @75% of max.. 18on-6off, 16" above plant. 90% of water...