Are these like small soda-like bubbles that persist and drift through the tank making it look cloudy almost? I found mine was doing that and there was a small amount of oil slick on the surface. I relieved my bubbles by adding a powerhead and getting more water movement.
I put a cheap power head from Walmart on the back wall of the tank near the surface so that it moves the water and ripples the surface. It seemed to break the slick and send it through the filter rather than letting it hang together where the output of the Emperor catches it and sends it down as bubbles.