ur fine as long as u did'nt break of any roots, and even if u broke off alil it would maybe stunt the growth for a couple days to a week i don't see any harm i just went with the 5inch just to make sure. the 3 inch pots they use in the areo pipe systems but they flower as soon as roots pretty much start showing so there no where as big as we would be growing there main thing is just growing enough to get an oz per plant