Clean the tank, dont over stock, dont over feed, reduce the time you have the lights in the tank on,dont have plant light bulbs if you dont have plant. I use Aquaglow light bulbs, the show the true colors of fish and deco better, they dont keep most plants alive and that includes algae.
If you have a lot of algae, you should try to understand why. It is often a sign that you need to make some adjustmants to the tank. The algea is your freind, it is often trying to help the tank by using toxins to grow.