Light is a Self-Ballasted Lamp.
Oh, so you have energy saving light bulb. Have seen 2 of those over a 10 gallon. Thus thinking 1 would be enough. Just get the daylight (6500k) rated bulb.
Just found a combination fert that is cheaper than $15. Heard about it at Atlanta Aquarium Association meeting. A single container is $10 + $6 for shipping. You mix 1.5 tsp. with 1 gallon of water. Then dose 5ml every other week. It last a long time. Thus perhaps could partner with someone.