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The reason you are hearing the noise is thet the motors are on the outside (reading the thread it occured to me) and Tunzes are inside of the tank, I can't hear a thing unless I press my ear to the glass-and I have three!
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Reefkeeper - (ref-ke-per) n: Individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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