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Looking at the 25-gallon aquarium next to my computer, I can tell you that the plants definitely sway in the current without any fish in the tank. Undergravel filters are on their way out -- power heads or canister filters are always recommended now. They provide positive filtration, and a strong flow of water.
To all those who are concerned that the swaying plants will be eerie, monotonous, or unnatural, all I can say is: Don't worry!
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