Many pet and aquarium stores will take uncured live rock through a process called curing. Once live rock has gone through this process it is considered cured live rock. Even though this rock is cured caution should be used when adding it to an existing aquarium with livestock. If you already have an aquarium stocked with fish, add live rock slowly over time. Adding a large amount of cured live rock at one time could make your ammonia level spike, which will stress your fish and invertebrates.

When setting up a new aquarium you can add as much live rock as you like because there are no other animals present. Generally you use about ¾ to a 1 ½ pounds of live rock per gallon of water. The weight of the live rock varies depending on how dense and porous it is. You can wait a week or two after adding uncured live rock before testing the levels of ammonia and nitrite. When these levels are at zero it is time to do a water change, ensure your pH is correct and then add fish and/or invertebrates.

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