for seedlings sometimes. those look like they have a root system growing.
Most keep water level about 1/2 in below net.
Ph of 6 to 6.2? Isnt that a little high? My hydro is running 5.7-5.9 max. Hydro should be run from 5.6-6.0 for most of our applications. I suspect nute lock out. Your uptake of nutrients are affected when you run higher or lower than these perameters
Do you have a ph or tds meter?
I would flush with 5.6 water with just a touch of b-1 or something like superthrive to help with the stress, then 1/8 or less nutes until you see some bounce back
IMO
Hope it works out
Vaper
The effect of pH on nutrient uptake depends on the nutrients being used. Some are more forgiving and less sensitive than others. I use Humboldt Master A&B and I don't worry as long as pH is between 5.5 and 6.8. I haven't made an adjustment to pH in 2 years.
Your speed is going to be dead slow now. I suggest starting over.. but first learning what happened. Btw hydro's ph sits perfect at 5.8, but I let mine swing (unavoidable with some nutrient lines)
Seedlings can't take that harsh training, it's going to take weeks to recover
That clone is already in mid flower looks like.. it'll be slow too, not to mention you need to not check on the roots all the time, gotta let them sit and do their thing.
What kind of water are you using? If it's tap, do a Water Quality Report search on google with your town/state name
30 ppm is really good, make sure they're not a lot of anything percentage wise, and you want to look out for high levels of chlorine, but a low level is actually nice on occasion (for water purification purposes) and you can just let it evaporate out anyway.
30 ppm is low, so you probably don't have much cal/mag in your tap, you'll probably need to add it if you aren't already
Are you using a ph meter?
Well just read that Dyna-Gro: Grow has 2% calcium and .5% mag.
How are you keeping your ph at 5.8 or near it without a meter? Strips are unreliable but better than nothing
PH/PPM meters exist but are more expensive