Need advice on these DWC plants (pics)

[jcommerce]

Facts about setup:

Two 7 gallon DWC bubbler setups under 270 Watt Superagro HPS bulb. Well ventilated at 76 - 77 degrees / 40% RH on 18/6 light cycle. 3 Mandala Satori, 1 Mandala Hashberry started from seeds. Plants first poked their heads up about 2 weeks ago and they've been growing quickly. R/O water with Botanicare supplements (Pro Grow, Liquid Karma, Hydroguard, Cal Mag). Started out with 1/4 recommended dosage for seedlings/clones for first week of growth and everthing was fine. (Ph was in 5.8 - 6.0 range and TDS PPMs were in the 300 range'). Did reservoir change and kicked it up to about 2/3 strength of recommended dosage for vegetative (about 4 days ago when plants got their 4th and 5th sets of leaves). Ph was kept in the 5.8 - 6.0 range and PPMs were brought up to the 850ish level (At recommended dosage it would have been well over 1000, but I've been trying to keep it conservative on nute strength). About 2 - 3 days ago, I started to notice signs of nute toxicity and overwatering with droopy looking plants and leaves showing "The Claw" look. I have since diluted the nutes down to the 650 PPM range and have added 2 more airstones (4 total now, 1 under each plant). The additional airstones perked the plants up temporarily, but a couple have since started looking droopy again. Also, newer and older leaves are getting wrinkly looking and they are curling inward with the claw look.

Plants are shown in order as follows: Hashberry /Satori 1 / Satori 2 / Satori 3

Any advice? I've tried to be so careful and conservative about not overdoing the nutes and I've been very diligent about Ph, Temp, Ventilation, PPMs, etc

[ChilliWilly]

looks like lack of oxygen. maybe the airpump/stones aren't giving enough bubbles, or the res is too warm?

[jcommerce]

Haven't check water temp in res, but I would guess it's in the mid - high 70's just like the ambient air temp. Water definitely feels cool, which should be good for oxygen levels. They are looking a little better today.

GANJA GUERRILLA, any thoughts?

[ChilliWilly]

what are the roots like, are they into the res, and have you got plenty of bubbles at the surface? Perhaps if you watered them less from the top that would help?

[weedies]

Some look like when I test my clones for roots. The ones that sag under my MH don't have root and are thrown out, but yours are seeds.... so..

Are you running the water pump 24/7? How do the plants look in the morning before the lights go on? How far away is your light?

[jcommerce]

Thanks for the thoughts everyone. I've been dilutingthe nutes down even more since I first posted and they're looking a lot better. I flushed them with Clearex today and let the system run for a bit. I then filled the res. with pure R/O and will slowly start to step the nutes up to the 300 ppm level over the next 24 - 48 hours. I was told that 300 PPM at this size is ideal (even though the directions on my nutes would have it at well over 900!) I was also told that for DWC Bubblers, you never want to be over 650 PPMs. Anyone had different experiences?

I'm going to play it safe from here on out.

Here they are 36 hours since I took the pics at the top of this thread (hard to believe these little bastards are only 2 weeks old):