What is air curtains?^
If i'm keeping a mom,I get tops.50-50 success.
No mom,I take a lower off the back 100% success
My moms usually come off a lower as I don't like topping my plants.
Bubble wand, air curtian... like this one.
I use the green ones at wallmart (fish supplies) : http://www.kensfish.com/moreinfo/marineland-bubble-wand-15-inch.html
along with their double outlet air pump (30-60 gallon) in a 1.5 gallon tub..
I've used rockwool cubes (ph pita), coco (gnats/ph), soil mix (gnats/ph). With the tub and 'air curtians' just tapwater, light and wait.