My O2 reactor is a big rectangular tank with plants in it. I pump co2 into it and shine lights on the plants.
Originally Posted by Rainer
You should post that in the DIY forum.
I think I like both of you.
To the OP - I think breaking the surface tension of the water (a surface skimmer was already mentioned) or using a spray bar is your best bet if you don't want to use a wet/dry. I'm no expert admitedly.