how the beep beep beep do i get rid of an oil slick at top of tank

[reefwars]

Try playing with your tuning I place a mark where I have it set and if I remember correctly more air is wetter skim less is dry skim it could be gbe versa I can't rember offhand but it takes a bit for the tuning to take effect it doesn't take much turning for my skimmer to see a big diff. I've never had your skimmer I can only assume there's a air intake you can adjust???