Instructions
Remove debris on the aquarium glass with a sterile (chemical-free) scrub brush. These cleanings should be done no more than once a week. Do partial water changes to get rid of the tiny algae blooms floating in the water. Change 20 percent of the water every day until the algae fades, then change 20 percent of the water twice a week. Avoid overfeeding the fish since leftovers create nutrients for the algae. Remove any uneaten fish food when you do any routine cleaning of the tank.
Check the filtration system. An older system may need to be replaced. The filters should be changed every four to six weeks even if the system is in good shape.
Change the amount of light the tank gets. Move the tank away from windows where the algae can use the sunlight to grow. If you keep your aquarium lights on all day or night, cut back to a few hours a day, or only turn the lights on when there's a need for them.
Insert a snail or some other algae-eater like shrimp or barbs. Check each addition to ensure it is a good fit for your type of aquarium and the algae itself. Not all algae eaters will eat the same kind of algae.
Insert a living plant that will compete with the algae for light and food. Strong plants like the Amazon Sword need only moderate care and will keep algae from growing out of control.
How to Kill Algae in Your Aquarium
Algae is a natural occurrence in an aquarium. Too much of it can become a major problem that ruins the beauty of the tank and endangers the health of its inhabitants. Fish do need some healthy bacteria in the tank, so always get professional advice before making a major change to the aquarium. However, you can practice some cleaning procedures that don't involve chemicals that will help eliminate the excessive algae.