Auto Week 7 Starting to Yellow

I’m on week 7.
Both plants have same treatment.
One on left is getting very yellow.
A couple leaves on bottom have totally yellowed.


Growing in 70% compost 30% perlite.
Fed them bloom grow micro one time 2 weeks ago but only water since.
Water every 4-6 days depending on bag weight.

2000w blue purple led lights. 24".
50% humidity
75 degree

R they same or different strains?

Yellow one is OG Kush. Middle is Bubblegum.

The first thing that came to mind looking at OG kush is nitrogen deficiency because of the paleness of the plant overall and it’s the bottom leaves that are most affected. The fact it is mostly compost throws that off though. FWIW

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They’re small they’re so cute :laughing::laughing: this is my glu gelato at week 6 today