11-09-2006, 08:28 PM
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5700K lighting, things appears more yellow. As you get towards 10000K, the lighting is more nuetral. 18000K, I'm not sure. But if you have fish only, they will not care whether it's 57000K or 18000K, it is only what best appeals to you. Plants will thrive best with anything above 57000K.
MH (Metal Halides) are not necessary for fish only tanks.
Regular kitchen, bathroom flourscent fixtures are not recommended becuase they reflectors are made to spread the lights wide into a room. Aquarium lights are made to direct light downwards. Plust the balast on kitchen/bathroom lights are not made for high humidity areas, such as being above an aquarium.
What you may want to look into is adding additional bulbs. For example, if you have a single flourescent lighting system, you may look into either a double or tripple lighting system.
EDIT: After looking at your signature, I noticed your 47 gallon column aquarium. YOu could add submersible leds, as previously suggested.
Also, zebra danios prefer more length than height.