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Couple questions about scrog DWC

Im working on my first grow DWC (link is in the sig) and i plan on doing a scrog. I have a 4x4x7 grow tent and two 5 gallon dwc buckets. Im about 5 weeks into veg and plan on making my scrog this week. I just had a few questions


1. At what height do you start scroging? My plants are about 10 inches tall

2. How would i do my res changes? My only guess would be to just drain out the buckets with the side indicator tube and refill by top feeding the hydoton?



Heres some pics of the plants



 
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