03-15-2010, 02:55 PM
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Agree, all you need is a new tube. A full spectrum around 6500K will work best in this situation. The tube in the fixture might have been fine in its youth, but all fluorescent tubes decrease in intensity within the first year, very much so, and after 4-5 years this is not going to be enough intensity. A new tube will do you fine.
In this size tank, it would look stunning with larger swords, like Echinodorus macrophyllus. Check out the plant profiles section, this species is there. And E. bleherae, just one plant, would grow close to the top of that tank and spread out within a few months. These plant species will do very well with a single full spectrum tube.
That could be a very lovely display, given the tank dimensions.