Aquarium dealers supply two types of lighting arrangements. The simplest includes a glass cover that fits into a lip molded into the plastic trim at the top of the tank. Across this, a long, narrow plastic fixture, called a strip light, holds one or two fluorescent bulbs.
The more elaborate arrangement, called a hood, completely covers the top of the tank. Lighting equipment is mounted inside the hood. Metal halide units and larger fluorescent units should have a ventilation fan to prevent overheating. Dealers offer hoods designed to match the aquarium. Choosing such an ensemble lends a finished, professional look to the tank, making it blend in well with home décor.
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