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I have a 30 gallon FOWLR set-up. It just finished cycling and I wanted to add more live rock. The live rock is coming from an asstablished tank. Will this mess anything up? Will it have to cycle the tank again?
How long will the LR be out of water? If it's nearby, cover it with wet towels (wet from the tank water) and throw them in an insulated container. There should be so little die off that it won't matter and you can put the new LR right in the tank.