absolutely. the finer the bubbles the more surface area for oxygen exchange while
the bubble is in the water. the bubble also takes in waste gases and when they break
put them up into the air. further, when fine bubbles hit the surface and break into
the air some of the water is airborne taking on more oxygen and falls back into the
water. also, the finer the bubbles the less disturbing to fish and the better the
movement of water from bottom to top... a very good thing. it is an old fashioned
idea/myth that oxygen exchange only occurs at the top. lots of the older GF books
say things like this.

NOW ABOUT THAT 5 GALLON TANK. it isnt big enough for even 1 goldfish so do get
guppies or white clouds. Ingrid

On Sun, 17 Feb 2008 13:20:17 -0500, (L u) wrote:

Should I get a bubble wand? It's a 5 gal tank. I want those "curtains"
of bubbles. Will they also make more oxygen? I have an undergravel
filter.