"william kossack" wrote in message
...

ones to think about installing for a 65 gallon tank. What is this DIY
CO2 system everyone talks about?

http://www.thekrib.com/Plants/CO2/co2-narten.html
DIY CO2 involves 2 litre bottles, yeast, sugar and water. For a tank of your
size, it can be done, but you'd need a series of 3 or 4 bottles, maybe more.