HYDRO Help ph and or nute burn

[Smoklahoma]

Can someone confirm what this is? Best I can figure is ph or nute burn from researching. Ph has been stable at 5.9 so I'm kinda leaning to the burn. Plants are 3 1/2 weeks from germination. Started nutes with 50% strength, which worked last grow after I burnt them with 100% in the same time frame. I have new lights that I am trying to find the best setting also in the mix. I turned them to 25% yesterday from 30% after I found this. Lights are at 36 inches from canopy and on a 20/4 schedule.

[gbauto]

Environmentals looks ok, but it does appear it's a bit hungry.
How are the roots looking? Solution temps?
Are you monitoring your light intensity? Those Timbers can crank out some photons.

[Smoklahoma]

Hungry as in need more light or more nutes? Water temp at 71, trying to work on getting back in the 60s. PPM was 670 but I cut that in half last night. My well water is 280 to start with. Roots look great, nice and white. I have no way of checking light photons. I turned the lights back up last night, now at 35% at 36 inches thinking it might help? These lights are nice, I just got to figure how much of them the plants want ?
The Blue dream are the ones in the picts. The Black widow on the other side are not showing these signs, but slower development.

[Smoklahoma]

After thinking about this a few days, I might have caused this. When I was trying to get control of my funk problem I cleaned everything with H202 mix. The last thing I did was dunk the starter plug and seedling into the mix then replanted. Probably burned the babies. Trying to get back on track yesterday, fresh nutes at 50%. GBAUTO asked a question I couldn't answer so I picked up a PAR meter to see were my lights are. At 36 inches set to 35% getting 310 to 330 at the plant.