If they're coming from your plumbing then you need to find a way to limit the bubbles getting to your return pump. If they're simply appearing on the glass you may have a fine sheet of algae producing them when the lights are on. Tell us more and we can try to help.
I hate microbubbles. Mine came from my HOB skimmer. I couldnt fix the bubble issue... so I put the skimmer on a timer to run when the halide goes out. Now I just dont see the bubbles