Hello Everyone, Ive been using my aqua lifter for the last couple months. And it seems like it isn't pulling the water out of my U-tube anymore. I drilled a hole and put a nipple on it at the apex of the tube to ensure it would pull the oxygen out. And i hooked up the return part of the aqua lifter into my power head so that it will blow a few bubbles into my water. I have algae growing in my soft line from my U-tube to my aqua lifter so I am assuming it could be a blockage. How would i clear this out? The aqua lifter usually has a hard time working against my power head so i shut off my power head every few days to run the bubbles out of the U-tube. It didn't work this time, is there a way I can flush this system, to get it back into working condition?