I have a 13 gallon with 15 W of lighting and light to medium planting. I am
hoping to increase this to medium to heavy. I have heard that using CO2 will
help the plants. I was thinking somethng along the lines of yeast/sugar in
lemonade bottles method.

Yeast/sugar/water bottle ===(CO2)=== primary backwash/emergency spill bottle
===(CO2)=== secondary backwash/emergency spill bottle ===(CO2)=== Aquarium.

Anyone got a recipe, such as ratios of yeast : sugar : water? Or other ideas
and suggestions?

Comments appreciated,

Marcus