After 9 months we had to take our 29 gallon tank down. We lost all the fish and decided to start over. I will be buying a new filter(Aquaclear 70). I have soaked the statues/decorations in very hot water and will let them dry in the sun for several days. Will do the same with the gravel. How do I clean the tank? I want to be sure to remove any algae and bacteria that could have cause all the fish to die. What is the best way to do this?