Bubbling aero cloner questions

im trying to build my own aero cloner because this method seems to work very well. i just bought 2x 15" air curtains and they are hooked up to a 20/60 aquarium pump the container is about 16" long 7"tall and about 12 " wide.
My questions are how do i know if it is bubbleing enough?
right now i hold my hand about bout 1" away i don't really feel very much and from the pictures i have seen on here it doesn't seem like it is bubbling hard enough

also wondering i read that you should not use nutrients or any rooting hormones is that true?

turn it on and put the lid on, after 10 minutes take off the lid, if the underside of the lid is wet your good. any dry areas wont be good locations for clone sites.

i found that a single small air pump is not enough for 2 airstones in a cloner. i had to get a second small pump and eliminate the "T" fitting