I didn't even think Co2 would go in there through the air pump. I guess I never put two and two together. I guess I learned something new today. I am trying to grow out my rotala Rotundifolia to a foreground plant, so I am trying not to trim, but I have been tempted. :S I'll trim soon and hopefully have some to offer up on here. I'll give it one more month, before I am ready to trim. I bet by then it would be up to the surface.