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

[Milad]

Originally Posted by zoaElite

Skimmer intake could be blocked, I would give it a good clean. I think if you can put your tunzee's on a wave maker you will fix the problem, 30 seconds on 30 seconds off alternating.

nope not blocked

My wave maker is on, my tunzes are on apex profile which is alternating by ramping up and ramping down every 5min (one goes up, one goes down).