Please help me diagnose this problem

Just moved plants from Veg to Flower room. All other plants are fine. Nutrients are very light Adv Nutrients Bloom formula. PPM is 510 and PH is 5.9 - hydroponic grow - top feeding bucket system.

Any ideas what is wrong with this poor plant?

I removed from system and soaked roots in water from reverse osmosis purifier.

Can anyone help me? I hate to lose this one! Thanks!

This has happened to my plants before. I don;t know why but I would like to find out. Usually when they look like this I will water them then the next day when the lights turn on they are 100% back to normal..

yer looks as if there wilting from lack of water

I thought it was from a lack of water also - so I turned on top watering full time for about 6 hours. No change. The other 9 plants on the same bucket system are fine.

I removed this plant from the system and rinsed the roots with purified water.

Now I am soaking the roots in an enzyme and vitamin b solution. Still no change.

Thanks for your help on this guys.

Has anyone had any experience with pythium?

Here is some information I found on it - An often-occurring mould affecting cannabis is pythium. This mould causes root-rot, and rot in the lowest part of the stem. It appears most in young plants, and in cuttings. Larger, healthy plants are less sensitive to pythium. Plants get 'falling-over disease' with a serious pythium attack.

Anyone think that this could be the problem?

They look like they got just a bit to much water man

Yeah I'm with shooter.

I would say they are WAY over watered.

Well it is pythium. I am in the process of cleaning my whole system with bleach and water.

Surviving plant roots are soaking in h202 and Pythoff. Just checked them and they are looking great so far.

C'est nightmare!!!

In retrospect my first clue was the fact that the ph was dropping. Told this to several local grow stores - I thought it was my water purifier (ro). They tried to sell me replacement filters. So - if your ph starts dropping remove your plants from the system immediately and start cleaning folks.