National Geographicâ„¢ LED Aquarium Light | Lights | PetSmart
Had this on a 1.5 gallon and was way bright enough. Its super convinient because it clips on. There are a lot of lights like this so im sure there are some cheaper ones. I would definitely go LED
for that small of a tank as they dont put of much heat.
20 Gallon Long
8 x Ghost Shrimp, 5 x White Skirt Tetra Glo-Fish, 4 x Ghost Cat Fish, 2 x Fancy Guppy, 3 x Marimo Moss Ball