I just run a bubbler in my 50 gal rez to add a little extra oxygen as well. Dude have been talking about running a venturi instead, but i can't find one to buy and setup out of the box instead of making my own
Here is how you see how a venturi works.
A venturi is like a upside down T.
On the vertical you connect a tube that is above the water level. This is where it picks up the air.
One side of the hortizontal bar is connected to your aquariumpump. On the other side the water + oxygen comes out.