Leaves Curling Down

Just as the title says.

My one of my Northern Lights looks bad..
I have 5 plants(2 NL, 1 SAD, 1 LSD, 1 Kandy Kush) They all look good and healthy besides this plant (NL#2)..



Third pic shows other plants and the bad one down low.

They are currently in ending their first week of flower and are getting 1/2 flower
nutes...Using Holland Secret

PH is around 5.5-6.0(drip test)

They all vegged the same amount and given the same nutrients
using a drip irrigation hydro setup..Flowering under a 400w hps.

Any idea? Looks like nute burn but dont see why this is the only showing signs...No tip burns on any other.

bump..anyone?

different strains take nute at different rates i would let it chill in some reg water for a few day and see how it reacts to that. If all the others are going good i wouldnt worry i would prob just kill it and replace that spot with a clone. It also could just have been a shitty bean sometimes you get a black sheep. Does look like burn.. classic downward claw with crisp tips. Did it start at the top or bottom? how do the bottom leaves look?

Thanks for the reply..and it happened over night...Fine one day when I woke up it looked like that. It didnt start at top or bottom just fucked up on me some how..