[Carmen]

Here's an online instructions manual for set-up.

http://www.aqua-medic.com/products/d...tand_Alone.pdf

I did run it in 12" of water but I think I had found something online that said it should be in 8"???Not 100% sure on that though. That skimmer ran perfectly and efficiently in 12" with a recirculating water hook up. I was then able to control flow through the outlet tubes using the recirc with a ball valve. The outlets should be only half full, more than that will make your microbubbles worse. Also if you can, use the black box to minimize the bubbles before they reach the sump. Hope that helps...