Pruning question?

At what point should I top my plants to promote multiple branches. The clones have been under the lights 24-7 and the tallest are about 7 in. And then, how many sets of leaves before topping again. Thanks

I would top them about a week before you put them in 12/12 lighting. I actually topped my clones when i got them. I topped them on their first day of 12/12 lighting. But it is better to do it atleast a week before. Good Luck