Posted: Thu May 12, 2005 3:57 am
it depends on how much water you have in there, your filter, if you feed your turtles in there, if its nearby a window, ect.
if the water stays clear for more than 2 weeks, then i would do a partial water change, like 25-50%. if its clear, but there is an odor, then i would change 50-75%. if it starts to turn green, i'd do a complete change and clean the filter very soon. if it starts to turn brown, i would change everything ASAP. i'm sure other people have different schedules for cleaning and u should check what they have to say.