| I have read of people who only run a couple of centimeters of water over the top of the substrate. This seems more efficient to me as well. Michelle your point about the oxygen is well taken. That possibly would have an impact on my concern with CO2 dropping the pH levels. What do you guys think?
Sorry I keep popping in at out at irregular times.....I want to know what is going on but I have a bunch of meetings today. |