A hood is required to prevent water evaporation and provide lighting. Rapid water evaporation results in a lower water level that may damage filters and heaters. It also causes a build-up of carbonates and minerals (water hardness) as water evaporates and minerals remain in the aquarium. An aquarium cover also prevents contaminants from getting into the tank. In addition, a hood will stop fish from jumping out of the aquarium. A completely closed cover has also been shown to be a major factor in maintaining aquarium temperature and keeping electricity costs down.

Marina Fluorescent Canopy - has a glass seal to protect light bulbs, and an instant-start feature.