I once heard for every foot of plant per gal of pot. ex.... 3 ft plant 3gal pot etc..... u must think about them 2x in size after flowering. So u said in five days u will induce flowering so just do the estimate on the size see what size they are now then double that size. With that u should know what size pots u need or already have. :thumbsup: As for the topping do it now while ur still in the VEG stage and have a few days left in that stage. Cause I did 3 a week before flowering and I had great results :thumbsup: So I did another 1 a week after flowering and not the same results so just something to think about :dance: