lighting question

you have almost 1wpg, thats low lighting. 2wpg is med lighting, and you can grow a reasonable amount of plants in 2wpg with out needing any co2. I like to keep the tanks at 2wpg. Anything higher is sometimes overkill and unnecessary if you dont have co2. I keep my tanks at 2wpg, and its enough light for my plants to turn pink- something you get from high light.

On several of my tanks, I have several fixtures bought from goodwill to add up to 2wpg

2 watts per gallon is a good place to start. please dont assume you need to shell out big $$$ for a good light. find out the length of your tank. then check out home depot or lowes or whatever local home furnishings place is near you. find a light of equal length. the packaging should tell you what the light is rated for (30 watts, 60 watts, etc.) the only other thing to keep in mind is the Kelvin rating of the bulbs. most pick between 5000 and 10,000 Kelvin. this is the color spectrum. i like 6500 K (fairly yellow), but you may want to go more towards the 10,000. this is a choice that is entirely up to you.

i suggest the home depot lighting thing because if you decide you dont like what you get, you arent out a ton of money

it also depends on the dimensions of your tank
the taller the tank the more light you are going to need. it would be clearly wrong to say that a 20 long and a 20 high need the same amount of lighting