06-13-2007, 09:16 PM
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First step is, make sure that is the source of the noise. If it is, just raise the level of the water within the overflow section by extending the height of the drain pipe. My overflow section is kept at a level about 2" below that of the main display tank.
I get noise from the syphon break hole on my inlet. The water pisses out of the hole and makes quite the rucus. My solution to that was the insert a piece of airline tubing into the hole, looped over the inlet pipe, and then wire-tied to of the inlet pipe so that the end of the airline sits about 1/2" above the waterline. This completely solved that problem.
The last place you can get noise from is the drain pipe itself. By creating a durso set-up, you keep the inlet submerged. This should eliminate that noise. To create a durso set-up, all you need is 2 90 degree elbows and a small section of rigid airline tubing (optional).
There is no reason to simply deal with noise. Most noises from the tank can be minimalized with little if any cost and effort.