Planted Tank Guru
Join Date: Jul 2008
Location: Morris County, NJ
WPG is an outdated rule. What type light bulb do you currently have? If you don't know, look for information on the bulb or just measure the diameter of the bulbs in eights of an inch and post the results here.
With lower light, CO2 is not required as long as you keep light and nutrients limited. However, if you have bright lights and dose nutrients you will need CO2. You can get decent results with Excel, but having to dose it everyday is a pain, and if you start slacking off on dosing the impact on the plants is pretty drastic.
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