Thanks so much for the reply. It helped a lot. Already changed out two skimmers. They all have Micro bubble issue.
I think this is about the perfect skimmer for this tank. especially with the limited sump space, this hangs on just right.
I have the output pointing to the left which is a few inches higher than the return pump in the back of the tank, SO I think this helps. I probably had a few micro bubbles the first few weeks, but sure don't remember.