yes 02 is very much needed. As for my skimmer i have a mrc mr2 single becket so i know i must have good 02
water surface movement can only aid to the tank but i like it flat.
Micheal
p.s. there are 02 test kits.......maybe someone can do a test to see if water surface movement adds 02 and if so how much more. I think there is a limit to how much o2 you can have at any given time. Lets hope someone has done this test as i would love to know.
here ya go straight up o2