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Hydrogen peroxide 3%, get a syringe ( no needle ) and squirt affect areas, you can do this in the tank, it won't hurt your fish. I got that tip from this site and it works really well, got rid of my algae problems with 2 treatment....amazing!! Good luck
I would avoid putting chemicals into the tank water. You never know how they will affect fish, plants and even the good bacteria. Some algae is natural and a lot grows in newly set up tanks because the water chemistry isn't stable.
You can control algae naturally, by introducing Common water weed into the tank. It's also called Anacharis. This plant is simple to grow, just drop individual stems into the water. It grows without being planted in the bottom material. The plant produces a natural chemical that slows or stops the growth of algae.
Plants require food, so by reducing the amount you feed, you limit the nutrients. Your other plants will also use some of the dissolved food and further slow the growth of algae.
Last, keep the tank water extremely clean and free of added nutrients by changing out half the tank water every week or two.
This approach worked in my larger, planted tanks. I have no visible algae in any of them.
You can likely get it from someone on this forum. Or, you can get it at the local pet store that carries fish and miscellaneous tank supplies. There are online suppliers, like alphaprobreeders.com