week 5 and 6 they will fill in and week 7 and 8 they will fatten up and harden up if all is done right.. diffrent strains very.I am on day 31 of flower and the buds are like tall and skinny and filling in gaps when does like the bud start to get fat and I'm using miracle gro bloom booster I just watered 2 days ago and just the tips are burnt on some of the leaves what could this be