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Unread 01/09/2009, 05:40 PM   #66
Lewy
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Join Date: Feb 2004
Location: Darwin, Australia
Posts: 304
Quote:
Originally posted by bowhunt10
Stupid question here. I understand how this works when using an overflow inside the tank, but how does an external overflow work and still go coast to coast and skim the waters surface? Would this be a box that hangs over the tank and is really just a giant siphon flowing into the external overflow box? The external would be so you don't have to drill holes in the tank or what?
An external overflow will still work the same. Instead of holes in glass you have to have a weir cut along the top of the glass. Obviously for the water to go into the external box.

If you have the room behind the tank. I would go this route as the internal box takes up a lot of real estate.

If it is a decent sized box I would also use additional bracing in the form of gussets for the additional support.


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