Leaf discolouring

SJ120

New Member
Hello anyone,
I've started getting a yellowing on some of my fan leaves and lower small leaves, can somebody give me an idea what could be causing this.
The strain is Berry bomb autos, 160x120x60 tent with 2 x 300 full spectrum LEDs, master grow nutriants, 12ltr smart pots with canna soil, 54 days old from first real leaves showing. 12-12 light cycle.
See attached pics.
Thanks for looking:peace:
 
image12739.jpg
 
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