Lou said:optimally the ammonia and nitrite should be 0, with nitrate being as low as possible. But aquatic turtles are not as sensitive to water conditions as fish, so its fine to have levels higher than the 0 mark.
Sigmar said:As dirty as turtles are theres no way you'll have those levels anywhere near zero unless your doing daily water changes or the habitat is heavily planted.
Rhyno47 said:I always did shallow water. Twice the shell length deep at the deepest point.