Controlling bubbles in your fish tank

I'm having a pair of golden fish and was able to notice lot of bubbles earlier. I read a lot in internet and everybody asked to load an Oxygen motor, But I dont want to spoil the neat look of my spherical bowl. So, I bought an aquatic plant of around 10 cm long and just dropped them into my bowl, the problem got solved!

Now, they are roaming around the plant and enjoying it. No artificial thing required for fish, they just go with nature.