A photoperiod is the length of the "daylight" period to which organisms are exposed. Changes in photoperiod have important regulatory effects in the life cycles of marine invertebrates and fishes. Regardless of the type or arrangement of the lighting system, it is desirable to have automatic timers in place to switch the

Reef Aquarium

#3. Paletta's system under 20,000-degree K metal halide bulbs, showing better balance than the pure actinic approach in photograph #2.

Reef Aquarium Images

#4. Finally, a combination of fluorescent actinies, 6,500-degree K, and 20,000-degree K metal halides that many consider most pleasing.

Reef Aquarium Plumbing Scheme

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Aquarium and Fish Care Tactics

Aquarium and Fish Care Tactics

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