any boday using the nano tunze wave box below the water like the instructions s say iv got a low wave set on the wave box its 1 inch above the water line it seem to be moving the sand at the front of the aquarium any idears on the mater at the other end of the aquarium is a tunze 6045 iv set the controler to 24 volts is this ok or can i change the voltage to say 18 is this ok
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