Advice needed

Two of my plants that are about two weeks old started drooping. I'm not sure if this is from over/under watering its hard to tell. One of the plants the leaf tip slightly curls, the other plant just seems droopy. The other 4 plants in the ecogrower seem fine.(two are about a week younger) also another thing, I had the 600w hps about 16" away. The tops of the plants still was 65-70 with a fan blowing across the tops of the plants. The two that started drooping are directly in the middle where the light is brightest. I moved the light up about 8" and pointed the fan away from the lights/plants. We will see if this helps. Below is pics and more info on my setup. First 3 pics are plants I'm worried about. Next is a healthy appearing plant in the same system. Last is a photo of all of them (remember the two little ones are a week younger)


System info:

SJ DR150 tent
Lumatek 1000w digital ballast
CoolStar Aircooled hood w/ 24" batwing
600w Solarmax MH
6" Can Fan outside tent blowing cool air through CoolStar out the other side
4" Can Fan blowing across plants
GH EcoGrower
GH WaterFarm
GH Flora series nutes - Lucas Formula
pH 5.8-6.1 both systems
ppm 350
Res temps 69-71
water runs one hour on four hours off (4 one hour waterings a day)
off during lights off

I'd say over water but it's a dwc right? Lol, copper causes wilt... Since your hydro you need your ph to be strictly 5.5-5.8 or you will lock out most nutrients the plant needs .. Magnesium needs a pH of 5.8-6.0, zinc needs 5.4-5.5,sulfer needs 6.0 exactly and molybdenum 5.6-5.8...And there's more but it's complicated, look for a nutrient pH chart for hydro, it'll help!

I agree, it looks like lack of 02. Canopy temps can/should be a tad higher. like 75-78F. Water temp is fine and can go as high as 71F before roots are more prone to disease and 02 levels decrease.
I am also picking up a slight blue hue to the interveinal tissue. That tells me that plants are early stages of Phosphorus deficiency. I like to let my rez fluctuate from 5.5-6.2, that way I get the best uptake of all elements.

And dude, you gotta change those watering times. more like 15min on/ 1hrs off----- 24/7!!!!!! The more oxygen you an get at the roots, the better growth will be.

Run for 15 minutes on every 4 hours.

Thanks for the info guys! I always thought the eco-growers and waterfarms are meant to be run 24/7? I will drop by the watering time.

Just checked them out. They seemed to perk up over night. Last night before bed I took the fan off them, raised the lights a bit, and dropped the watering time to 30 mins on/4.5hours off. Also I took away the 30 min watering during the lights off cycle. Oh ya I bumped the ppm up to 430.

My waterfarm has been running 18/6 watering schedual for the past week. The plants all seem healthy, should I lower the watering times for this unit as well? I have read many different opinions but most people say waterfarms are meant to be run 24/7.

Here is the waterfarm, seedlings seem alright.
Also here's a link that explains the waterfarm watering schedule. https://www.rollitup.org/hydroponics-aeroponics/541146-gh-water-farm.html

Any thoughts?