If it’s not the light, it could be the low amount of P in your feed as to why your internode spacing is really short and the plant isn’t getting very tall. That feed mix looks to be a 5-1-5 NPK mix. I usually run closer to 2-1-3 in veg. 1-2-3 to 1-3-4 in flower… Regardless, she’s lookin pretty over there 
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