2nd DWC grow why does this happen?

2nd grow DWC D2W what causes this?
One feels pretty crispy, they are sitting around 350-400ppm and temps sit around 68-70 F give or take, I let the ph drift back to 6 around a day or so then drop back down to 5.5/5.8, I really wanna do this type of grow but I feel like I'm missing a important tip, maybe I should just try coco since it's similar and more benefits for my situation (trellis/just water nutes in like soil)

The first time I tried this and it happend, it looks like pythium or root rot but not sure, I have 3% h202 if needed but idk how much to exactly add, I also have added UC roots at 3ml/gal (the buckets holding 3gal). They have weird spotting a discoloration going on, would love to kn9w how to correct this, if I missed anything lmk thanks!

How does the water smell? And what nutes are you using?

Such a small root ph should not run soo fast

Allsoo your ppm could be high how does it change from day to day? Up or down? Those are seedlings they dont need much

What do you use for ph-

You can use trichoderma or h202 but that will kill all life in the bucket.

Temps in the environment are good but what's the temp of the water? Ya getting any slime on them roots? Them roots should be pearly white. They are having issues eating below so they are eating themselves..lol. I'm guessing them water temps are to high.

amneziaHaze said:

How does the water smell? And what nutes are you using?

Such a small root ph should not run soo fast

Allsoo your ppm could be high how does it change from day to day? Up or down? Those are seedlings they dont need much

What do you use for ph-

You can use trichoderma or h202 but that will kill all life in the bucket.

Click to expand...

Water smells I guess what you would kinda expect to smell like there is this weird gunk that ive never seen before, my first time it was just a thin layer of it i guess b7t this time its realy thick it looks like, never seen it before like this, how do i get rid of it?, not too smelly but a hint of "old" water smell kinda, my res temps are saying 66.2F as of 5pm, my ppm for this banana photo is sitting at 350 ppm, I used General Hydroponics flora trio with calmag and used their light feeding chart and even halfed that regiment they recommended at like 1/4 the first week and half the 2nd which is what I'm counting currently up until this Sunday when I change my res again, there seem to only be two problematic ones atm, my banana photo and a og kushx vanilla frosting is acting kinda funky thr same way, dry older crispy leafs, too much light? I got the ppfd for them around 300mol around canopy. I keep ph around 5.5-5.8 do I need to me stricter with ph? I used GH ph down btw.

It could just be a uncalibrated ph pen too I just noticed my battery is getting low.

Fatjoe said:

Temps in the environment are good but what's the temp of the water? Ya getting any slime on them roots? Them roots should be pearly white. They are having issues eating below so they are eating themselves..lol. I'm guessing them water temps are to high.

Click to expand...

My pen says 66.2F on one of the problematic ones, but I heard even with cool res temps you can still get slime/pythium, how would I correct this, I have h202 and uc roots swell as hydrogaurd but I know hydrogaurd is bennies so I'm trying to just keep it sterile.

I also heard gh can stain roots abit but this does look like root rot to me.

More picture of ither plant

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65° is getting near the point where you're not getting any P uptake. If you can get water temp to 68°, you can remove that from the equation.

If the air temp is 70°±, that would cause a small plant because the metabolic rate is very low.

It's not a light issue. 300µmol is good for a young seedling and they plants aren't showing signs of light stress.

Step through the graphic that I've attached to rule things out.

I suspect it's a nutrient/water/root zone temp issue.

His waters too cold.