I was having issues with my skimmer where suddenly I had to start adjusting the flow valve. I did reach out to Coralvue on RC but we never figured out the issue. Thanks to Mike over at Captivating Coral. He advised there was calcium build up in the section where the air hose goes into the fitting. It was full of white porous calcium. I soaked it in vinegar as Mike suggested and then poked it out with a toothpick. Thought I would share this as its not something one would typically look for or it could be overlooked. The arrow marks where the clog took place. Thanks Mike. 
