I've had my 9004 DC running for a little over 2 months and figured the little bubbles it's producing would have subsided by now? I notice them coming out the sides and figured I just needed to let a surface film develop inside the skimmer but it doesn't seem to have made a difference. I tried lowering the pump to minimum for a few weeks to see if that would help, but no luck. Any tips? It's more of a minor annoyance than anything. I'd just like to see the water crystal clear rather than seeing lots of really tiny bubbles blowing around.