[Damon]

Lighitng is only ONE factor of algae growth. Lack of CO2 and ferts will also encourage algae growth. Fast growing plants outcompete algae. Higher lighting will allow for a bigger variety of plants. With a 10 gallon already set-up, one could convert it for less than 60.00. While you may thin thats a lot, the money goes to lighting. Slow growing plants are nice, but are more succeptible to algae attacks then nutrient sponge plants. I'm not necessarily saying you need 3.6 wpg. but I've heard the story too many times a person wants real plants, goes out and spends 20.00 on them only to have them die because of improper substrate, lighting, and nutrients. And you are severly limited to plants you can grow.