Algae problem in freshwater fish tank?

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I feel your frustration. My tank had staghorn algae and I've tried everything, the stuff just keeps growing no matter what.

there are algae elimination products that you can buy.

Common mistakes by new aquarium owners are: Setting up the tank by a Window, setting up a tank near baseboard heating. By a window encourages two things-sun light will encourage algae, and heat from the sun will damage the seals on the tank(think it heating up and cooling down each day). Baseboard heat does the same thing, and the tank may POP and flood the room eventually. 

Try limiting the amount of light the tank gets each day-it will get algae to some extent, probably less with a natural bulb. 

And check your chemicals in the tank. 

You said that the tank is near the most natural lighting in the house.  Thats your problem, natural light grows natural plants, algae is a natural healthy plant that is good for your tank. 

If you want to get rid of the algae, get the tank away from sunlight, keep the lights in the take off for longer.  Consider different lights.  I used Aqua glow light bulbs for 10 years because they make  coloring of the fish look amazing.  I also had very little algae if any.  It not enough light for most live plants , not surprings.  

Other things= Live plants use up the nutriants that algae needs to grow.  Loaches dont eat algae.  Snails do.  Nerite snails are great, but mine never managed to remove all the algae way back when i had algae, they would mow crop circles in it.  

I use a plastic gift card thing to scrape algae oss the walls now that I swithched lighting from aqua glo bulbs back to hopefully plant growing light strip..

You need to cut down on light. 8-12 hours is recommended. I would reduce to 8 and go from there. You may want to turn down the intensity of the light since it gets light from the sun. Adding plants and snails can help too. 

Two suggestions: Avoid natural lighting as much as possible unless you need it for aquatic plants. 

At least in theory, green light would be the best. Chlorophyll absorbs mostly red and blue light. Also, add snails. They area lot slower than a razor blade scraper but they work long hours without pay.