Its not that bad really. What you need to do is invest in the right filters. If you buy a filter that is rated for twice the size of the tank you have, you will have no problems. I have a 125 gal and a 75 gal. I have two turtles in each tank. The only thing I do is 25 % water change once a week or every other week with a siphon and clean the filters every 6 months or so and thats it. They are expensive to set up. People dont want to spend the money to set them up right and they have all sorts of problems.
I think they are so much fun. Very interactive little guys.