Advice? Micro Bubbles

Have a emperor 400 bio wheel filter unit spitting micro bubbles and its driving me crazy!!!! I've tried positioning power heads to no avail. Water level is up over the returns so its not that causing the problem. Anyone know how to solve this without changing filter systems. I don't have the room to run another filter system and leave this one on until new bio media seeds with bacteria.

 

Figured it out on my own but thanks anyway. I removed old emperor 400 filter unit and put on a new 400. I put the wheels from old unit on the new as to not lose bacteria. I also put three carbon pads in with loose carbon in the gray snap shut piece. If this helps anyone then it was worth posting.