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When you read 0 for ammonia and nitrite and see a nitrate spike. Then take them out and do a big water change. There is no set time.
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8G Peacock Gudgeon, 75G CA/SA cichlids, 120G Planted, 50G Mixed Reef ( Build). 125G Reef and 100G frag tank in process.
Save the reefs... Buy captive raised when possible!
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