I just want to be sure on this, is it ok to add a little more live rock to an already established tank?
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Thank you.Adding live rock to an established tank is typically ok unless it has dead/decaying matter in it. Most people would recommend making sure that the rock is not going to have an ammonia spike in your tank. You can always do a water change and add the new rock to in a bucket or tub with the water from the change. Watch it for a couple of days or a week and make sure no ammonia or nitrite show up. If they do, change the water every couple of days as the nutrients rise and then when the nitrates are steady and no more ammonia or nitrite shows up you're good to add it.