Drain Pipe Height?

[moosemj]

I am plumbing my 300 gallon tank and have never had a predrilled tank. Already have the returns plumbed in, how high should my drain pipe be? Does it matter? It is a 1.5 inch pipe. Thanks in advance for the help.

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[joe jaskot]

The height of the drain pipe determines the height of the water in your tank. The top of the drain pipe should be about a 1/4" - 1/2" below where you want your water level to be.

 

[moosemj]

So the water flows over the top though the slots, and then down a half inch or so to the top of the over flow. Does anyone use a prefilter at that point?

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[Gill Blue]

my tank is 26" tall,my overflow slots are 24" from the bottom, the top of my durso drain pipe is 23" from the bottom.
I have a screen over my overflow openings. I did try some poret 20 ppi foam, but it slowed the flow too much.