How dirty does a tank need to be before a skimmer actually skims? Tank has been up for 6 weeks, clowns in for almost a week after their QT. Cycled with ammonia. Little bit of food since. I've had this skimmer at 4 different heights multiple times for multiple days. I've plugged the holes on the thingamajig on the side of the skimmer. I've added a valve to adjust air allowed into the thingamajig. About the only thing I haven't done is my next step which will be a sledgehammer. Skimmer is a reef octopus 150. Ammonia, trite and trate are zeros. Salt is 36. Temp is 77.8 atm. PH is 7.96 but fluctuates to 8.04 (discussion for later). Please help before I lash out irrationally.