Fluorescent Aquarium Lighting Fluorescent lighting fixtures are the most common way hobbyists light their aquariums - they run cool, come in different colors and the bulbs are inexpensive to replace. Generally, NO (normal output) fluorescent bulbs will sustain fish-only tanks up to 16" deep, and HO (high output) or VHO (very high output) bulbs can adequately light deeper fish-only tanks or low-light reef tanks. Some of our hoods also have built in fluorescent fixtures.
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