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#1
10-13-2012, 01:31 AM
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Maybe you could try open-topped standpipes, and use a gate valve to adjust the height above the pipe
My chaeto tank has this and, with the water about 1" above the pipe, it's silent and no bubbles. If I lower the level below 1" it will suck air And, of course, the drain is under water in the sump The valve doesn't noticeably slow down any flow - it only adjusts the height The pipe on the right is an emerg overflow   
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#2
10-13-2012, 04:05 AM
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Just what I was about to say Greg. You should put a ball valve in and throttle it back so the pipe fills with water as I think there is not enough water going through the pipe. This is then get swooshed around in the tube creating he air bubbles. It might work Dustin. Try them without glueing first to see if it works.
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206 gal tunze centre overflow star fire front illumina 260 Loudest part of my system would be the nagging sound I hear on a regular basis about how much time and money I spend on the tank.
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#3
10-13-2012, 04:17 AM
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i put small valves on my airline tubing to adjust how much air goes in , works every time, so instead of restricting the drain itself to make it quiet which is a bad idea if you dont have an emergency you restrict the air , the less air the faster it drains your overflow box(put your finger and block your durso it drains the b ox fast untill air starts to get taken in and make horrible noises) the more air you allow in the slower you make the drain.
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