With a 46 gallon tank, it can be hard to get enough CO2 in the water with
DIY.
I would go with compressed CO2. You could run all your tanks off of a
single
CO2 cylinder.


Leigh

LeighMo is right, algae doesn't necessarily have to be in your tanks. It's
all about balance. Just adding more light isn't going to lead to great
plant growth, they still require two other main resources, co2 and
fertilizer. If you can't strike a balance between these three elements,
then the tank will be unstable and algae will be able to thrive on the
excesses.
-Cesium