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Old 05-22-2006, 12:28 PM   #1
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Getting tank drilled for overflow.

My 60g is almost ready for water. Im getting the tank drilled for the overflow soon. From what I have seen there is a smaller diameter and a larger diamever tube in the overflow, what is the point in that?

http://www.acrylicaquariums.com/aqua...overflow_2.jpg

Also how do I determin how much flow I need going into the sump?
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Old 05-22-2006, 12:39 PM   #2
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On mine I have a valve that I can control to match up with my return pumps.
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Old 05-22-2006, 12:41 PM   #3
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Ok I was planning on adding a ball valve. So I only need 1 hole drilled? What size is yours? Is 3/4" pvc enough?
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Old 05-22-2006, 12:48 PM   #4
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I have a double overflow with one hole in each and they both enter in the refuge part of the sump. I did not build mine so I dont know what size but just looking at it it looks bigger than that.
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Old 05-22-2006, 12:50 PM   #5
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Well it would look larger on the outside, its sized by the inside diameter.
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Old 05-22-2006, 12:53 PM   #6
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Sorry I`m not good at DIY projects. I just have them built for me. Maybe someone who knows will tell us.
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Old 05-22-2006, 12:56 PM   #7
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Np, thanks for all the help though. What type of media do you have in your overflow?
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Old 05-22-2006, 01:02 PM   #8
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I have bio balls soon to be LR rubble.
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Old 05-22-2006, 01:24 PM   #9
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Cool, thanks again.
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Old 05-23-2006, 02:40 PM   #10
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I assume your tank is acrylic and not glass if drilling. Most glass tanks use tempered glass on the bottom which can not be drilled.

The larger/smaller holes are so you can drain into one and return from the smaller hole not for draining from both holes. This is designed to be used with a completely closed canopy in which access from behind is limited.

You don’t have to have a return hole but if not then you have to have room behind the tank to run the return back into the tank.

Usually the standard sizes for the drain hole are either 1” which realistically gives you about 400 gph or 1 ½” which is closer to 800 gph. If getting it custom drilled I’d personally go for two 1.5” holes for draining and two ¾” to 1” for return to give you plenty of gph to play with.

Most sites say a 1” will give you 600 gph and a 1.5” gives you anywhere from 1200-1400 gph but I have never seen that much flow personally.

For return lines check out www.modularhose.com for great prices on Loc-Line.
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