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Well I have done alot of looking around for equipment. If the bottom of my tank is tempered, could I make a overflow box off the back?
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A tough thing with doing an external overflow in a tank that didn't originally have it is making all the notches on the back glass for the teeth. I've seen a few people do this on nano tanks but I haven't seen anyone do it with anything larger than a 20 gallon (I'm sure someone has done it).
The main things you have to be concerned with is the strength of the glass with the notches cut out (you have to notch part of the frame out also).
Then you must have an absolutely leak free drain box on the outside that won't stress under the weight of water pouring into it and can support the weight of your plumbing.
The good thing with a seahorse tank is you won't need a lot of turnover, so a coast to coast overflow isn't needed, you could go with a smaller one.