Does anyone have a plan for creating a standpipe. I have a 120 gal that has been drilled in a overflow. trying to get a standpipe going unless I can get some better suggestions. Please let me know. Thanks!

Here is a good DIY standpipe.

http://www.stockmanreef.com/aquasilencer.htm

Here is another good one:

http://www.aquariumlife.net/projects/diy-overflow/74.asp

http://www.dursostandpipes.com/