No first leaves

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So I'm trying to learn coco. Planted this seed 12/7, it sprouted 12/9. Today's her fourth day and still no leaf. Usually they already have the first set, and the next one's growing. What could be the problem ?

Problem: no first leaves after 4 days
Medium grow method: coco+20% perlite in 9.2l airpots

Feed and supplements used: canna coco @100ppm + rhizotonic @50ppm

water source: tap water that I've let sit for 36h

Strain/age: Mephisto double grape

light used: hps 400w cooltube

Climate: 60%rh 22-26°C

Additional info: 4 plants under the hps. The others are in soil. It's my first time in coco.


- pre-watered it with 0.5ml/l of canna coco a+b (=100ppm total) and 4ml/l rhizotonic (about 50ppm). Ph6.

- Watered to runoff round 36h before the seed hit the coco.

- Re-watered it yesterday because the hps causes massive loss of water in coco.
 
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