01-23-2013, 11:58 AM
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Sponge filters themselves are noiseless; you can hear the bubbles breaking the surface if the air flow is high of course. The noise comes from the air pump that drives them. I have my tanks in a dedicated fish room so the noise is not a factor, but if the tank is in a room where it would be, you need a quiet air pump [some are, though I have not experimented sufficient to suggest which] or a different type filter.
The filter in the video you posted is a home-made version of a normal internal/external filter, but one also needing the air pump which is where the noise again comes into the picture. This is one option. Another is a simple sponge filter with an enclosed motor-head to replace the need for an air pump. The Fluval "U" series is based on these; the U1 is just a sponge filter and motor, and the U2 and up are like the one in the video except the motor is included.
In my 33g I have an old Eheim model that is just the sponge with a small motor, and I have had this running for years. Not a sound, and reliable. Unfortunately, for some reason Eheim stopped making these. The Fluval U1 is the closest thing I have found to this, but I have not myself tried the Fluval U1 so can't say much about it.