Answer by  
                                                                                          SunnyStars (836)
                                                            
                          
                          
                                                          Although the PH level isn't quite as important in a turtle cage as it is in a saltwater aquarium, aquatic turtles will need a PH above 7. 0 to build strong shells. Test the PH every 2 weeks using a water quality test kit. Rainwater, RO water and soft-water lowers the PH so don't use those in an aquatic turtle tank.