Is that a 600hps...if so you need to run it 100%... I did the same my first grow ran my 600 on 60% at first and they stretched until I put the ballast on 100%
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I started my first grow with Nirvana Northern Lights Auto-flower at the beginning of November. I agree that the seeds seemed very small that I received, but they are growing fine. Good luck on the grow, but it looks like you have it well in hand with a little help from your friends. I'm gonna sub this grow if you don't mind.