Algae are quicker to adapt to fluctuating CO2 levels, so WC favor them in a low-tech tank. Tap water is higher in CO2 than your tank water.
The Fraternity of Dirt #41
SunSun Pimp #66
"In the end we will conserve only what we love. We will love only what we understand. We will understand only what we are taught." Baba Dioum