Notice that the larger plants' widest leaves have just recently reached the pot rim. That means your root system is pretty much in place and now those plants will turn their energy towards building greenery instead of roots. You can expect rapid inch-a-day growth the next 2-3 weeks as they kick into full vegetative mode. My point is that you can predict root growth by watching how wide the largest fans are. Helps you manage height issues as well as being better able to time any moves from (veg) room to (flower) room. Works for me, BigSteve.