Microbubbles appearing in a established protein skimmer

Ok so last night I emptied the cup on my eshopps PSK-75 and now it is throwing microbubbles in tank again. I've had the skimmer in the tank for about 8 months and its well broken in so I'm not sure why this would randomly start happening? I don't like the bubbles cause they cause the tank to look cloudy and I can probably guess that it blocks some of the light penetration in the tank.

 

When was the last time you pulled it out for a cleaning and service? Its 8 months, you should be doing that every two months or so. Take it out, scrub it down, run it in vineager for a good couple hours, rinse it then reinstall.