If you have enough live rock you don't need the bio balls. I have read you should remove them slowly so the rest of the system has time to adjust, but I have never had bio balls myself.
Most people are ditching the sponges for filter floss in cubes. You don't "need" chemi-pure or purigen but they don't hurt. Other options are carbon and GFO.
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72g bowfront, t5.
29g JBJ nano cube, ATI 26HD.
Livestock: clown fish, chromis, coral beauty.
Corals: Toadstool, maze brain, candy cane, mushrooms (purple & green hairy), button polyps, green zoas, GSP.
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