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Microbubbles and Noise It is normal for the Remora to release microbubbles back to the tank, especially during the first week or two of operation. During this break-in period, the skimmer will also run louder than normal. You should see a decrease in microbubbles and noise after several days of operation.
I think "several days" is a bit optimistic, as skimmers can take up to a month to properly break in, but you should notice a reduction once it does..... just keep in mind that between the pump running, the air sucking, and the natural noise of a skimmer, it's not going to become whisper quiet.....
I haver and love my remoras. Yeah, they tend to be a little noisy even after break on but I love how much it pulls from the water and cant find an alternative skimmer in that price range for a smaller tank without a sump.
It will quiet down quite a bit after a while though, like said above, just hang in there. lol