I thought I would pass along an experience, in case anyone out there is also dealing with the same problem.

Because we must leave the lights on our turtle tanks on for 10-12 hours a day, the water can become susceptible to green water, which is a single-cell algae that makes the water look like a thick, dark green, pool of nastiness. No amount of filtering, water changes, carbon, etc. will relieve your tank of green water.

Well, I have been battling this for about three months. Never had a problem with it for more than a year. By the way, it does not harm anything, it just looks terrible and makes guests ask, "why don't you clean your turtle tank?" or, "are your turtles alive?"

So the only two things I know will get rid of green water, Green Water Tabs, which are no longer produced, and a UV sterilizer, I did not have access to. But finally, a friend and I moved a 350 gallon aquarium for someone who gave me his UV sterilizer because he bought a new one. And lo, I have been without green water for two weeks now. My spotted and painted are swimming in crystal clear water as we speak, and I love it.

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