Just purchased a used tank with a used 2217 . Question I have is do I replace all the media ? It's been sitting dry . I know I need to replace the sponge on top . Thanks for the advice !
So turns out it wasn't sitting dry .the thick blue sponge looked good so I soaked and rinsed it in extremely hot water " could barely stand my hands under it for more than a second or two and rang it out till it was clean . Soaked and cleaned bio balls and the othe hollow media in same extremely hot water . Got a new top pad . Going to fill the tank now , add bacteria , and hurry up and wait for it to cycle lol thanks !