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I would think having 1/3 of your biological filter already established, the cycle would go considerably faster than starting from scratch. How long? Let us know, and you'll be adding to body of aquarium knowledge.
Yeah, you don't need the extra biomedia, regardless of the material its made of. It's great for nitrification, but the end product is Nitrate, hence the 'nitrate factory' label. In sand beds and live rock DE-nitrification can occur, leaving only nitrogen to bubble out harmlessly. You've already got plenty of surface area for nitrifying and denitrifying bacteria on your sand and rock.
Good luck with your project!
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As many naturalists and environmentalists have suggested, we should set aside our arrogance,
our desire to conquer and control everything, and walk hand in hand with Mother Nature. -Walter Adey
Current Tank Info: 180g Seagrass Sandbar Lagoon, START DATE November 28, 2018
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