Planted Tank Enthusiast
Join Date: Feb 2003
Location: San Juan Capistrano, CA
Depends on how much maintenance you want to do (and if you have Co2). I ran 2 x 36 watt on a ten gallon and it was great. The only problem was that the stem plants out grew the tank to fast. I am going to set that tank up again, but this time only using foreground plants. Smaller tanks need more WPG.