How do you know? 
Everyone is a brother until they specifiy lol
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Great job Next time pinch at 3 node, she branch out and increase your take lots.
Super crop that main branch. Bend it so canopy
Light coverage is even.
Your soil is great, I use both FFHP
Or Ocean.
Your light is garbage.
I use cheaper ones but a Mars 600 can be had for
70 ish bucks on Amazon
Or another type will work , I can fit 4 in 5 gallon
Pots under one 600.
Remember to defoliate fan leaves around week 5 of flower.
Oh i.use FF nutes. Cha ching, Beastie bloomz etc.
Welcome to the wonderful world of growing your own, be it a tomatoes or herb
Most satisfying.
Gl
If I can help in future pm me.
Remember to keep your water ph correct
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