I just got my 125 gl setup this weekend. I am looking to setup for freshwater. The setup I bought was originally used for a turtle tank. The tank is kind of dirty from hard water stains. What can I use to clean it, that is also safe when I fill it with water so it does harm my new fish? And also some of the sealant was scatched up a bit from the turtles, it is not peeling and it does not leak, should I have someone reseal it? or should I just leave it alone? Any reponse would be much appriecated.