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Hi buffdog, welcome.
Is that a wick system underneath or do you water from the top? What kind of nutes are you using? Rockwool seems like such an interesting medium.
My last grow I vegged until about 12". Overall plant height ended up somewhere around 20" The rule of thumb is to veg half to a third the height you want them to stretch to in flower. Every strain is different though.
If you happen to grow them too big you can always tie some branches down (LST).
Good luck with your grow.
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