Droopy leaves w/curled edges

Coco.
Flushed to <100 PPM, PH adj. to 5.8
Indoor
PH runoff 5.8
City water PPM 70
(sets for 1 week w/airstones
prior to use.
Age of plant. 5 weeks from seed, LA Cross and 2 Fence Line clones
Type of fertz. H&G Cocos full line.
Rate of application.
500 PPM final
top drip/run 1min. on / every 6 hrs. 10 cups pr/cycle ( Last run 5 min. on (lights on only)
1 gallon pots / 1"gravel on bottom.

Typical fluction in chemistry. Average.
AM reading PPM 500 PH 5.8
PM reading PPM 550 PH 5.5 - 5.6
Chemistry adjusted bi-daily.
2 1000w HPS vertical 18/6
75F lights on
65F Lights off


Reservoir Temp. Unknown but would guess 70F
Reservior size.
20 gallon recirc system. Top off every other day with 2 week clean and change.
R.H. 40-45%
Ventilation.
Inlet 500CFM
Discharge 400CFM Can Filtered
3 24 box fans for circulation
12,000 BTU A/C
Grow style
3 shelf 48 plant vertical, circular
coliseum.

Room 8 x 8 x 8


First 2 pics of LA Cross from seed shows leaf edges curling up.
2nd 2 pics of Fence Line clones show droopy leafs.
Thanks in advance for any ideas as to what is causing this. t

looks fine, good actually

i think the edges curl to catch more air or something like that not sure tho

the droopy leaves could be cause its the end of a long day, its needs water, or possibly some K