I honestly don't think it is a big deal and ends up going away once things get settled in. I don't know why it does this but I am setting up a 40gal community tank and mine did the same thing. Bubbles everywhere on the top on the sides, the bottom, and my heater. Same thing happened with my 10gal but it goes away with time. If you want you could possibly net the bubbles? or pop them or something I'm sure. I just left mine alone.
I use city water.