These bulbs will let you not only grow anything you want, but also have the most amazing vivid colors in your tank and use much less power than any other bulb with much better results:
http://www.reefgeek.com/lighting/T5...00K_Midday_Sun_T5_HO_Fluorescent_by_Giesemann
Nothing comes close to these bulbs but with your tank the problem is that the bulb itself is 22" long. If you have to have a fixture that is 20 inches long you are stuck with using Compact Fluorescent bulbs.
--Nikolay
http://www.reefgeek.com/lighting/T5...00K_Midday_Sun_T5_HO_Fluorescent_by_Giesemann
Nothing comes close to these bulbs but with your tank the problem is that the bulb itself is 22" long. If you have to have a fixture that is 20 inches long you are stuck with using Compact Fluorescent bulbs.
--Nikolay