04-12-2008, 12:37 AM
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Well, right now you can only put a max of 19 watts in, which is still way too low. There are a few different routes you can take. You can go out and buy a new light fixture, or you can retrofit your own one. Personally, I just usually suck it up and shell out the cash. I've got three 24" coralife fw single strip lights, and they work very well for me. They're 67k light, and 65 watts each. 65 watts for a 20 gallon is very generous, your plants will do very well in there. You've already got flourite, which is great, but you'll also need to add a liquid fertilizer (if you don't balance out everything you'll just end up growing algae!)
As for retrofit kits, there's a lot offered online and in stores. The ones I've heard the most about are by AH Supply, although I've never used them myself. They're supposed to be the cheapest and quite user friendly.
It's really up to you, but if you cheap out and go for a lower wattage, you'll probably end up regretting it and buying something better later, which will in turn be more expensive. I'm of the opinion that a good light is a worthwhile investment.