Ready to use. Used about 1.5 gallons of distilled water and immediately placed the fish and within a few days the fish were hopping up and down the length of the tube. The remote has multiple color options, but I don't use it. The sounds produced by this device are the same as an air pump for an aquarium. It's not bad. Mine is in the classroom and you don't hear it at all because of all the kids and their movement. I want more to make a bubble partition.
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