External Overflow with Slot cut in back of tank

[Pyrojon]

I'm thinking about a new tank and for various reasons I need more return flow then the normal corner overflows can provide.

I was thinking about cutting a couple of large horizontle slots into the back of the tank and siliconeing a external overflow box to the back of the tank.

I know I have seen projects like this in this forum in the past but since ReefCentral's search function doesn't really seem to work anymore I was hoping someone would have a link or could lend some info.

The tank will be a 180g, there will be two or three slots around 10"x1.5", and the external boxes will probably be about 10"x10"x5" with 2" bulkheads back to the sump.

Any idea how much water I can pass through a slot that size?
Any idea how thick the glass should be on the external boxes? I figure they won't have much water in them so they don't need to be very thick.
Any idea if this is even a good idea?

Thanks
Jon

[dandy7200]

Here is mine, (http://archive.reefcentral.com/forums/showthread.php?s=&threadid=789613) I just siliconed the overflow on and will add pics of that later.
Here is another (http://archive.reefcentral.com/forums/showthread.php?s=&threadid=587075) and one more. (http://archive.reefcentral.com/forums/showthread.php?s=&threadid=534878)

[Stile2]

Here are the two that inspired me.
here (http://archive.reefcentral.com/forums/showthread.php?s=&threadid=444094) and here (http://archive.reefcentral.com/forums/showthread.php?s=&threadid=271539)

Have fun,
Keith

[MayoBoy]

Here's a different search function that works all the time

http://reefcentral.com/search.php?s=&menu=11

[Pyrojon]

All very good links (especially the search link ;) ) many thanks!

Has anyone had any second thoughts? Would you have done it differently?


Many thanks
Jon