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Will I disturb vital bacteria if I remove the rock rubble from the back of my tanks refugium to clean up and put back? Im scared to do it thinking it might do some serious damage. Is this alright? Has anyone done this before?
How long has it been established? Can you take the fuge offline completely when you do the change? What is the total water volume you are working with?
Put the rock in a bucket with some tank water. I usually take a couple of 5 gal. buckets when I do a water change, fill them half full, and use it to rinse off the rock, and replace it when I'm finished cleaning the fuge.