The dirt substrate...is this supposed to happen?
My 20g low tech dirt tank has been running close to 2 weeks now. I begin to notice that the dirt layer is slowly forming air bubbles. And this layer of air bubbles is slowly separating the dirt layer. Throughout the day, I also notice that air bubbles would get released naturally. My question is that is this supposed to happen? Is this the way the dirt breaths? By creating enough pressure for the air bubbles to get forced out through the top substrates?