I know the only purpose for the bubbles is to disturb the surface and add more oxygen and blah blah blah. I had a bubble bar that sent up 3 streams of bubbles but my pump had another outlet so I figured what the heck and tossed in a little bubble stone. The stone gives off more bubbles all by itself than the bar cuz I didn't bury it. These bubbles are in my 30 gallon fern gully tank, which is occupied by male and female guppies and babys of assorted ages. Is this too many bubbles, or can it be good for them?