If you are noticing more algae than usual with these longer summer days try moving your betta tank away from natural light sources like doors and windows. Remove any uneaten food or debris from the tank and increase your water changes. Nutrients from fish waste and decaying plant and food matter feed algae and can make it hard to keep at bay. Limit the light to 8 – 12 hours per day and reduce as necessary to inhibit algae growth. Monitor your water temperature daily, keeping it stable between 76 and 80 Fahrenheit.