A 3 week cycle is possible but you need seeded rock with half new half old saltwater, cycle should be minimal if you have those. If you are using substrate instead of bare bottom then there may be a diatoms and even hair algae phase on the sand.
Good luck on the time line.
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Always looking for the next best coral...
90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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