Finally, life is good...

[Canadian Man]

The point is that I have kept fish for about 40 years, and have read numerous books. During all that time it has been my understanding that bubbles pumped into water do not increase oxygen levels. It is always possible that all those authors were wrong, or there has been more recent information.

Well when I run my skimmer my ph is day 8.2 / night 8.1
When I do not have my skimmer on my ph is day 8.1/ night 8.0

I believe this proves that they do add oxygen to the tank becasue the obvious result here. I do also have an overflow and lots of other opportunities for air to be added to the system. The skimmer just top's it off.