@Scarredskull, fimmed is a topping method, it's used to turn a traditional christmas tree like canopy to a more open even flat canopy, I would definitely recommend fimming, google fimming, lots of google how to videos, as for ph I've been keeping it at 6.2 entire grow cycle, but that's because I use canna coco, I would go with the ph level the nutreint company u use suggests somewere between 6 and 7 ph I would assume
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