YAY! Some one answers! My tank is about 7 months old. What do you mean by different level settings? Like what angle the skimmer is in? If so yes I have.
I dont have the skimmer in my sump. It's hanging off the back of the display tank. The pump is about 5in under the water level. I have cleaned the pump alot this past week. Its a aquamedic 2100 pump on the skimmer (came with it). Maybe its broke.
On my oceanrunner pump the impeller broke off of the magnet.I had to glue it.If it is broke good luck trying to find parts aqua medic burnt down like a month or two ago>been trying to get replacement impeller for mine with no luck.
I just went to aqua medic site to look at the pic.Try to turn the knobs on the top/front to restrict some water flow.Mabey your flowing too fast throught the skimmer?