Planted Tank Enthusiast
Join Date: Feb 2013
Location: Jacksonville, Florida
Speaking strictly from my neophyte experience...
Green algae seems to favor high light, low/off balanced nutrients. BBA lights sub par lighting, with high nutrients (nitrate, specifically). Higher lighting = less nitrate, but also less CO2. Low CO2 + high light = green algae. It's a balancing act (difficult to maintain with DIY CO2 and a small tank).
From a lighting perspective, bulbs change output with age. General rule of thumb is ~1 year for a plant bulb, but there are factors that would shorten that life. Higher than normal voltage at the wall, voltage surges/sags, room temperature, extended photo period. If in doubt, pick up a new bulb and try it. If that doesn't correct things in a few weeks, then you can put the old bulb back in and you'll have a spare.