I skimmed through the thread but I have a huge micro bubble issue with my fx5. I've cleaned everything and thought it might be debris in the water so I added an AC
110 with filter floss. I unplugged my 2 Rena 300 pumps, didn't help. I unplugged the fx5 and the micro bubbles went away and the water was amazingly clear!! I don't have dirty water by any means but micro bubbles just ruin a nice show tank.
I plug the fx5 back in... And bam!! Micro bubble city!! Drives me crazy!!
I'll be watching this thread closely for advice and answers.