open top tank?

[Aquattro]

Originally Posted by Atomikk

Now I know some people have sumps that are open top.. but that is not enough.

Hmm, my sump is bigger than my tank. And my skimmer injects air into the water. I think I'm ok
Seriously, I'd like to see an O2 content comparison between a tank with glass lids and without. I doubt you'd see a difference at all. As long as you have good flow, surface agitation and a sump that overflows from the main display, O2 would be my last concern. CO2 off gasses very readily, and temperature would play a bigger role in O2 content than glass lids.
The reason to not have glass is to maximize the light entering a reef tank.