One thing I'm not sure if I mentioned this but , it might occur in 18/6 also, in my veg tent the seedlings have been needing transplants much sooner then the clones for instance the clones can grow up to atleast three times the size of the container no problems and the seedlings about the same size as container then transplant before much bigger. Just a quick observation but this may be true in most environment s I'm not sure, starting to filter out many experience s with the 18+ veg cycles I've ran in the past.