Your buds appear to be pretty firm.Have they started swelling up?You know about checking trichs,but when getting toward end,you'll see your buds swell up and get heavier.Im guessing 3 wks tops
Since they come ph balnced.you need to lower the rocks ph down to 5.8 or so like legal said.I soak mine overnight in water ph'd to 4.2 and the rocks are right where you want em.without ph'ing your rocks,your ph will rollercoaster.
If the ones in the 2 buckets have no expectations on yield,flower em now to keep plant smaller.if those 2 plants were to flower now,they'd probably hit 2 1/2 -3 ft. tall.Then you can see how thos buckets handle that size plant.
It just doesnt get much easier than mosquito dunks to rid gnats,Dont kill the live ones,but its not about killing them,its about stopping the their chain of multiplyng.Totally gone in a week or less.The live gnats will die off in a few days.
You can take some clones from the females and plant them too giving you more plants.Just cut a node from each plant and put them under 12/12 indoors to see which ones are girls.