Nutrient deficiency, lockout, or burn? HELP!

started these seedlings about 3 weeks ago, and put into the rockwool about 2 weeks ago.
I know i should start half strength feeding them now.
I did feed them a little early maybe started 1/4 strength about 6 days ago but stopped a day and a half ago because the plants started exhibiting problems.
My ph meter had broken at the start of this grow and was unable to ph level test the water but it is reverse osmosis water/and or distilled water.
I just got a new one in the mail today and my water is reading 6.4-6.5. I know this is a little high for the beginning stages but could this simply be whats causing all these problems? Im using the GH flora three part series. 24hr t5 light thats going to start 18/6 tomorrow(saturday 5/19)

any advice would be greatly appreciated.
Im lowering the ph of my reservoir as we speak and if thats the only problem great!
but i would like to see what you guys think
also my strain is black ice OG



thanks again!

they look over watered to me

Which of course probably means over feed...so back off the ppm and carry on...they will be fine...and if you handwatering then stretch out the dry time more.

thanks for the fast response, that definitely could be it. Ill keep that in mind

bump, cut back on waterings and feeding plants 5.0-5.8 ph water. plants are doing a little better and are in a dome now so its a wait and see. still want to see if anyone has any different opinions.

I would listen to what missnu typed. Wisdom there