I get the algae problem, had it in varying forms for years and I have tried various chemical treatments with varies success. What I have found however is that the addition of live plants starts to reduce the algae dramatically, in fact, the more plants I add the more the algae disappears. And they don't have to be fancy plants either, bog-standard Amazon Sword seems to do the trick. I prefer the plants to the chemicals and the more I add the less the algae appears. But it takes time and if you have a new tank it will be trial and error until you find the good plants for your set up. Don't be put off, I've spent years trying to sort algea out and it still is an ongoing situation.