What can I do about algae in a turtle tank?

I have a small aquatic turtle (who looks like a cow, but without the red marks, not sure what it is.) About 5 inches Shell measurement. Even keeping up with frequent changes of water filter cartridges, I'm still getting a great accumulation of algae, especially at the edges of the rock pilgrims, and shells of the turtle. I use filtered tap water, and chemicals can only add one to remove the chlorine, and one to help breakdown the waste. My filter is a regular aquarium filter, rated for 60 gallons. (tank 20 gallon long) I've read that the destroyers of algae in an aquarium would be used to regulate could be harmful to the turtles, so I feel a bit reluctant to try that. I put a few plants in the tank, but tends to pull them out and eat them. Does anyone have any suggestions on what I can do to slow growth algae in the tank?

Actually, it's best to add live plants. Algae is opportunistic, and grow in excess, if there is no competition in the tank. Anacharis works wonders. It feeds on turtle feces, is a oxygenizer, the turtle can eat, it looks a little pretty, and helps keep algae down. You can also add Exo-Biotize Terra, but in reality, be the size of filter you do, it is best to live plants, although getting unearthed if aquatic plants are going to do well.

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