Well while building my tank, I needed to build the plumbing for the tank overflow, so while perusing the DIY, I remembered a thread by FLETCH,
Try this for your over-flow ( Quiet ) :~) , which described a great Idea.
So here is my version.
It is adjustable as far as what height you want the water level inside the return section of the aquarium.
If you want the level lower, you push the tube deeper down the stand pipe, and ,vwella,
the level lwoers, and vice versa to raise it to over the top of the end cap.
I used 20" of 1" PVC for the stand pipe.
The top consists of a 2" to 1 1/2" reducer with threads on the 1 1/2" side, and a 1 1/2" end cap.
I placed the pipe up into the top section and marked on the PVC to where it would be covered.
Then i drilled two holes through the PVC above that line by about 1" to 1 1/2".
The PVC does not fit snug in the top, so I secured it with silicone.
I drilled a hole in the top the size that fit some standard air line snug. And I am using a 15" piece of air line for the vent. This baby is smooth and quiet, and I can adjust it to eliminate the babbling brook effect from a shallow return section, (just a 3" drop will cause this).
Here are the pics.
Also included is my return from sump nozzles, which is simply 3/4" PVC a 3/4" elbow, and a threaded fitting to accomodate the lock line nozzles.
Chris
_________
90g AGmegaflow, 30g Sump/refug, mag18 recirc, 2 mag 5's in tank JBJ235Watt PC Turboflotor1000 150LR 100LS 17corals Clown,Lawnmower Blenny, Chromis, Anthia, 3 emerald, 1 electric blueleg,3 scarlet crabs.
&&&&Another Great SIG By NAUTILUS
Quiet and adjustable Overflow 
Re: Quiet and adjustable Overflow 
How'd they do that?? 
I Love My Sig By John Hawkins!!!!!!!!!!!!!
