Help with Overflow Design Issue

SFMAquariums

New member
Hello,

I am looking for some help with a tank I am building. I bought a house last year with a 225 gallon aquarium built into the basement wall. I am currently trying to get it setup for my first saltwater tank!

It’s quite the ambitious project for me but I am very much enjoying it so far. The most recent issue I am facing has been designing the overflow to my sump within the current tanks limitations. There are currently 2 holes drilled in the tank:
- one in the back left corner, in the bottom of the tank.
- one in the top right corner, in the back wall of the tank.

I am planning to do a Durso standpipe in the back left of the tank since there is only one hole drilled there in the bottom that will suit that purpose well. However, due to the size of my tank & for redundancy purposes, I also wanted a second overflow. With the pre/drilled hole in the back of the tank on the opposite side, I was planning to do an external overflow box & initially ordered the Eshopps Eclipse Overflow Kit (Medium) for this purpose. However, last night I was messing around with my tank & realized that there is only 1.5” of clearance between the interior wall of my tank & the inside of the drilled hole. The weir for the overflow kit I ordered is 8” long & the through bulkhead is 1.5”, so I would presumably need 3.25” of clearance between the edge of the weir & the inside of the drilled hole.

In other words, I don’t think the weir/black box will fit into my tank with the hole that has already been drilled. I have added pictures that will hopeful help illustrate this point.

I have therefore cancelled that order & am now looking for alternative solutions. Does anybody know of any easy solutions for this type of issue? My first thought was that maybe I should order the same box & can just DIY the weir when it arrives - cut it down to size. I’m not sure what material it is made from or how easy that would be to do. Alternatively, do I just need to drill another hole a bit further down to provide the required clearance? Im not sure that would even be possible because the aquarium is essentially immovable with its location in my house. It would have to be drilled in place. Any thoughts or other suggestions would be GREATLY appreciated.
 

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