Asp - those are live plants, correct?
I think how many live plants you decide to have will influence your bubble decision. The bubbles cause surface agitation - which will reduce the CO2 levels. Plants use the carbon for photosynthesis. Herein lies the dilema.
What I have decided, with many questions and answers from MFT, is to have the CO2 running 24/7 and a airstone on a timer, when the lights go off - the airstone goes on. The airstone agitates the surface, helping to reduce the CO2 so the fish have plenty of O2. And I also get to see some bubbles.
But if your not going for the big time planted tank, I'de keep the airstone. I love bubbles!