well, it could be. you would have to evaluate your nutrient export and if it's as much as, or more than what you are putting in, then it very well could be the bio balls. in other words, if you have a killer protein skimmer, do weekly water changes, feed reasonably, and have a reasonable bio load, and are still having algae issues, then yes, i would nix the bio balls.
i'm assuming you have live rock in the tank. if so, you won't need the bio balls.