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Beautiful. It almost looks like an incredibly successful FIM. Hoping it provides extra come harvest 🌱

It’s a personal thing honestly, you gotta find what works for you. That said you gotta try some stuff to figure that out first. Personally, it comes down to how long you want to wait to flip to flower cycle light 12/12. If you want to start flowering in the next 10 days - top it and leave 3-5 nodes, allow 7-10 days recovery time and switch to 12/12 If you wanna do more substantial training and are not in a rush to flower - you can do stuff like manifolding/mainlining Which will give you some bigger yields..

I think you’re talking about the stretch in this question. The majority of the stretch will happen the first 4 weeks of flowering. After that it’s mostly bulking.

Everything looks good to me, Nutrients are on par. Plant looks happy and healthy. Keep an eye on the leaf tips. If they brown then you have added to many nutrients. Its better to be on the lower side. A hungry plant will produce better buds then an over fed plant. As for roots you could get some Root Juice, but I don't think its necessary. If anything getting some Top-Max would be more beneficial. Happy Growing

You have options to enter wet weights or dry weights. Whichever one you chose is just fine, or you can do both.