Give us some more info please Angel if you know...

*This is 15 watts fluoro lighting on a 5-gal?
*How many hours do you have the lights on each day?
*How long have the plants been in the tank?
*Did you add salt to the tank?
*Any fish in the tank?
*What's the GH of your water?

Algae is normal. I like there to be some algae in my tanks... it gives them that lived in feeling! ;)