*Whats wrong with this plant?*

My other two are doing fine, but this one is weird...cant figure out why the leaves never got green....For some reason when it sprouted the leaves were black and they turned the greenish yellow and stayed that way, while the other two are deep green and healthy.

The sick one is a lowryder2, as the two healthy ones; the one in the front is bcn diesel and the one in the back is another lowryder.

Running davids grow nutes

Lights:
3 26w 6500k
3 45w 6500k
1 65w 6500k
1 85w 6500k
1 45w 2700k

The first few pics are of the sick'un and the rest are of the good girls...

Would really appreciate the help guys!

Really? Can't no one tell me? I know they're shitty pics but damn

looks to be nitrogen problem but they look fine tho

1st thing start by covering that rockwool up or you are going to get algae, what do the roots look like on the sick plant? White, brown, slimy that is going to tell the tale, what are the res temps?

If they are all in the same container I think it will not be nitrogen, something else is going on.

cutler is a pussy

Def gonna cover up the rock wool(thanks) but the roots are white...res temp is 72 degrees

Now my ph is a little high at 6.5 but I dont know if ph caused that yellowing

Try and lower the res temp a little along with the ph to 5.8 . If your temps are at 72 you need to be using h2o2 , good idea to use it anyhow. Or look into beneficial microbs.

Also since that plant may be in lock out mode, foilar feed for a few days until the peroxide has a chance to fix whats going on.

Good lookin out cuz....this won't harm the other two wil it? Wouldn't wanna fuck em up seein as their doin so well...the one in front has 6 nodes and it's only 4" tall

no it will help them a bunch also

update:

It still looks funny but is growing fine, just not as fast as the other two...
i thought it was the ph until it came in the mail last week and it is stable at 5.7...i still havent seen any change though.

Its flowering so i think i should leave it alone. what do u guys think?