tank
since your buddy is working at the glass shop-ask him to get a tube of nuflex 333 aquarium silicone from cascade.what i've been doing with my overflows is using a length of 4" pvc drilled with 1/4" holes 1/4" and 1" from the top and slotted with a dremel to make a long oval hole spaced 1/4" apart.works well with a stockman standpipe and doesn't take up a lot of room
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