Is a partially covered long 20 require an airstone? I have a Cascade 2000 on one side and a Whisper 10 with one airstone on the other side. The tank is in our living room and the air pump can be heard when listening to quiet movies or snoozing. So, do I actually need the air pump for gas exchange on the water surface. Or, will the HOB provide enough oxygen? I have one Betta (Judas) and 5 Panda Corys. I have checked and done what I could to silence the air pump as much as I can.
No, using the home theater with 15" subwoofer to over ride the din, is not an option.