Gdp day 32 of 12/12

How are these looking? They a touch darker than they should be ? Im growing in coco using canna nutrients.

When is best time to add pk 13/14 ?

3 x GDP grown under 300 watt led , temp 80 humidity 50.

You'd want to add them asap, right about now is the time if not a tad earlier, Looks like the plant is plenty well fed otherwise - so don't overdo it too much.
 
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