I'm not so sure you've got BBA forming but more like fuzz algae or Oedogonium algae which is short and gives plants a fuzzy look. Either can be killed with peroxide or liquid carbon. Are you using CO2
? If so up your bps. If your using liquid carbon increase it. You might still have to cut your lighting hours or figure out how to do a siesta. What ferts are you using? BBA usually but not always starts around the edged of plants and is more tufty. That looks more fuzzy to me.