Tank is 60cm deep. This information came at a good time. I am about to buy a new bigger tank. I can now buy a T5 lamp into a new tank, which also will be 60cm deep. Usually I am running pressurized CO2. Now it has been out of use for about a month, since the bottle emptied. I have not noticed any difference in the amount of algae. I'm going to put into a new aquarium still pressurized CO2 on again.