A clean environment and clean water is vital for the good health of your turtle and the larger your turtle grows, the more important water changes become. Dirty water will also cause lack of appetite and other more serious health problems. So always remove any uneaten food in your aquarium.
Remember that just because your water looks clean, it may not be. It could be polluted and/or acidic, so get into the habit of regularly testing your water with a good PH test kit available at reputable pet stores. The ideal PH is slightly alkaline – between 7.4 to 8.0.
Do regular partial water changes every week. Around ¼ of your aquarium volume is good and make sure you leave it no longer than two weeks between water changes. Add clean water that’s at the same temperature as the aquarium water.