Small fish: the 10-gallon Tank kit is ideal for small tropical fish like guppies and tetras. Energy-efficient: LED lights require low energy consumption, contain no mercury and are better for the environment than fluorescent lights. With the Flip of a switch, low-voltage LED lights illuminate your fish! Three-stage filtration: Tetra whisper power filter provides an effective combination of mechanical, chemical and biological filtration for clean water and healthy fish. Customizable look: Included Reversible Aquarium Backgrounds allow you to customize your aquarium. Simplicity: the all-in-one kit is easy to set up and clean. Simply add water, fish, decorations and substrate of your choice!