Reef systems can vary in content. Aquariums containing predominantly soft corals and invertebrates can function effectively with lower light levels than systems including stony corals. Mushroom corals frequently open effectively in lower light conditions. Placing them at the bottom of reef structures is generally recommended. Certain species of green marine algae are desirable in marine aquariums. They contain pigments very similar to other plants and are very attractively displayed with Life-Glo 2 bulbs. Systems containing varieties of hard corals require intense lighting with much emphasis on higher color temperatures. A minimum of 4 Watts per gallon is recommended for this type of aquarium.

2 Watts per gallon is adequate for this type of aquarium.