I am the owner of 3 aquatic turtles. As crazy as it sounds, even though I hate the look of algae in fish tanks, I find it good looking in my turtle's tanks. In a tank with a RESxYBS and a wild caught western painted, the RESxYBS is developing algae on his shell, but the painted is not. Is this algae harmful, beneficial, or does it matter. If it is harmful, can I just take my turt out and scrub it off with a toothbrush or something? He is extremely tame, so it would not be a problem. Also, why is the painted not developing algae? Something to do with being wild caught perhaps?