Auto leafs yeloowing sides

Fluffybuds1992

Active Member
Hello guys here is one of my autoflowers she is 20 days old. Any ideas why the leafs are yellowing on the sides and a little on the tip the led light is about 20 inches away the other three plants that i have are fine. The temp is beetween 25 c to 27 c and the rh is beetween 45% to 55% i have been giving them plain water with a ph of 6.3 to 6.5
 

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