Hope you're all smoking fine

I have a 3 week old strawberry cream starting to show signs of yellowing and was wondering if anyone has any ideas as to what it could be?
Setup (pics to follow):
15L Pots
Growell's Tropic Mix
Fed with Indica nutrients range - they're a brand new brand i'm trialling
Soil pH - ~6.1
Soil EC - ~473
Base water - RO water EC 22
Invisible sun ish265v2 type R at about 24" from tops
Lights on - 5am
Lights off - 11pm
Environment temp 24h min checked at 4:30pm - 21 Celsius
Environment temp 24h max checked at 4:30pm - 25 Celsius
Plants have been topped once
Pics:
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