Planted Tank Guru
Join Date: Dec 2002
Location: Portland Orygun
If you are going to use Excel the surface turbulence issue is moot. It only becomes an issue when you are injecting CO2 gas into the water.
The Eclipse hoods would not be my first choice for a tank. The light is directed toward the back of the tank. I feel you would be better off with say an Aqua Clear filter and a better light fixture. If you want a cannister filter then get one. A 20 gallon tank is right at the lower end of the size where a cannister filter will work.