My first post here. I have an old Eclipse 37 gallon tank that I have nursed with plants and fish for over 5 years with same light setup and substrate. I plan rebuild from scratch, new substrate, DIY overdrive the light system (as I read about here) and add CO2 with the Red Sea regulator kit. Does anybody have suggestions where I can buy a 10 lb tank of CO2 at a reasonable price? Or is $110 to $160 the going rate for this item? Location is Fort Worth, Texas.