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Old 12-16-2009, 03:59 AM
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do some research on Durso Standpipes, not sure about using them in a right angle situation, but that is what I use and my overflows are silent.

Durso Standpipes allow you to regulate the amount of water (water level) in the overflow so the water isn' crashing down at the bottom.

Good luck!
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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