HC Cuba question
I just came across a thread where this guy was growing HC Cuba in a tank not filled with water. The sand was really wet though, and he planted the HC in there and let it grow in before he filled the tank. To avoid algae, and for whatever other reasons.
My question is this. If I were to do the same, plant a beautiful carpet of HC with a empty tank, then fill with water, would I need to inject Co2 to maintain the carpet?