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For aqua clear you have the sponge at the very bottom. On top of that is carbon, purigen or whatever you need then on the very top you should have bio-rings, matrix or the off white short cylinder things that came with the filter. These can be in a filter mesh bag they have on amazon. Use the one with the bigger holes.spike98 said:What steps would I need to take to change from carbon pads to bio rings? Any brands you could recommend? And is there anything else I am required to have with the bio rings?