See how the cotelydons are curled down? That a sign they are being over watered. The best way to water rockwool is to dip half the cube in a container with nutrient solution. Its ready to water when the top to the cube starts to feel dry.
Discoloured leaves - any idea?
One plant looks great - in my opinion
The other looks terrible
Both plants have been feed the same nutrients
Water levels in DWC are fine, water temp is great
2 pic of the hurting baby
1 pic of the healthy one
@JMAGOO fix the PH mate it needs to be between 5.5 and 6 for hydroponics
otherwise the plant is unable to access and uptake the nutrients .
So ditch the nutrient solution in there now and add fresh solution PH'd to 5.7-5.8
you should see recovery of the newest leaves but the older yellowed ones are shot sorry to say
Hey man looks clean. Just some advice and pointers if I may based off experience? First off we want our temperature gaps between lights on and lights off to be no more than 9 degrees less when the lights shut off. Exposing cannabis plants to large temp fluctuations in veg and early flower will result in unwanted stretch. We avoid this with nice tight temp gaps up until the plants finish vertical growth by weeks 4 to 6 of flower. Then we want to expose them to temp gaps beyond 10 degrees less when the lights go off as once vertical growth is completed it will instead signal them to put extra energy into the budding process and resin production. So for this stage I would just ever so slightly shore up those nighttime temps to get that gap a little tighter. Secondly, I grew in DWC & then built 2 under current systems with 5 gal buckets and uni seals I ran 2 8 plant systems. Be aware of how fast the roots will grow they will take over the entire system if vegged to long. My last round in my systems I vegged to long and the roots grew down all the pipes and took over every bucket and the crop finished like shit because of it. The roots will grow like monsters, Also if you have yet to do so get yourself a thermal laser temp gun & a PAR Meter to better read your plants and get the most potential from your lights. If you havent yet, Research VPD vapor pressure deficit and how it relates to growing cannabis.
I hope these pointers help! If you have any other questions feel free to ask friend. Check out my 200 light 7,000 plant diary & follow my profile, I just put up a youtube video of it as well! Happy growing bud.