Moorish Idol - Take 2

[Samw]

Originally Posted by Aquattro

Breaking the surface is what forces CO2 out of solution, not adding air bubbles. All an airstone does is force water from the bottom to the top, breaking the surface, so a pump doing the same is the same.
I also have a skimmer going, which is a big contributor to off gassing CO2.

An airstone isn't going to happen, too much salt creep and bubbles

Yes I realize that, but you'll need a small water fountain to get the same results as the air stone or protein skimmer. Even hang on back filters which breaks the surface does very little compared to the surface breaking of an airstone. But OK. Maybe you have a lot more splashing at the surface than I thought (which would also result in salt creep).