I don't think it would be too late to switch to 20/4. It should do ya plants a favor i would of thought. Everything needs to rest at some point but you might want to wait for some with more experience to comment as i have only just started myself.
Dude you are sailing through!!! Plants look awesome! Can't wait to see that blueberry take off.:-D
Switch your lights to 20/4 or even 18/6 I don't think it would be a problem! :smokebuds:
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