I have the protein skimmer that comes with the Red Sea e260 aio. It has just stopped producing as many bubbles. It is still pumping water but I don’t think as much. The air intake has always been very noisy until now. If I plug the air intake line with my finger the pump moves twice as much water. I can barley feel any suction. I have taken out the pin wheel to clean it and made sure there was no obstructions in any part of the air intake. Thanks for any help.