Update. After watching it for a few days I think that my problem is not particles getting in the line, but air. I just don't see any particles of arm floating around the canister. Everyday the drip goes down to a 1 per 5 second drip. So I open the pinch valve and the water comes out fast then I have to screw it back in to where it was. I also can get the flow going again if I shake the drip hose. I read on reefcentral that air can clog the line. How do I fix this? Should I increase the feed line pressure into the canister or decrease it?