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join the forum redearslider.com. the people there have answers to anything you could possibly want to know about any pet turtle. i have asked crazy questions and always get the answers. iv never had algae problems with my turtles- so thats why i recommend that site.

If you really want to remove it, dip a soft toothbrush in table salt and brush it with that. another approach is to introduce tadpoles to the tank. They eat the algae and the turtle eats them.