I'm guessing that these are PC
bulbs. As Jose7878 said they have probably shifted and need to be replaced. I would also suggest reducing your photo period to no more then 8 hours. If you don't have a clean up crew now is the time to add one. Even with only 2 fish you should have several snails and hermits working in the tank.
You may also want to invest in a Phosphate test kit and test your tap water. Phosphates will fuel algae outbreaks and cause you all kinds of issues. The best option is to get a RO
unit so you know your source water is 100% pure.