New tanks are always going to have some algae issues. Keep the front glass clean with a scrubber or cloth. Good fertilizing (N,P,K, and micros) and carbon source (CO2 or excel) will keep the plants healthy and allow them to out-compete most of the algae.
Getting the right doses of each nutrient will take some tinkering and guessing at first, but you've got to get a starting point and from there. (Example; I started with the Seachem Guide and with a bit of DIY CO2 and then made adjustments over time as I saw changes, problems, changed lighting, etc...)
But, like chagovatoloco has requested, it's hard to give accurate advice without some info on your set-up and what your current routine is.