Skimmer help

[Big Tang]

Hey Ian i have the same skimmer an my 220 i run it off one of my over flows direct to the skimmer.I had the same problem till the skimmer broke in it only took about 4 skimmer cup's full of water to calm it's self down. Been running it for 1 1/2 years with no other issues and it pulls nice stinky nog out daily. I have the two straight lines on the knobs face out from one another hope this helps.