Just installed it and turned it on. In all the forums where I just read about him, they wrote everywhere that he was silent, right at all. Maybe I have such a sensitive ear, but it makes noise at the level of a refrigeration compressor. Which is not very cool, because. The aquarium is in my bedroom. But the fact that he is an outsider - you can build a soundproof box, which I seem to be doing in the near future. I put it on a double layer of 10mm foam (polyethylene foam insulation), although 1 layer was fine. Perhaps it has run in, maybe the bacteria have created some kind of lubricating layer, in general, the noise does not interfere in principle.
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