Thanks guys. Feel free to make suggestions or tell me if I'm doing anything wrong. I'm just doing what i think
Added picture of overflow box. I made a DIY bulkhead with 2 3/4" bushings and silicone around the edges. Then there's a piece of pvc
pipe with an elbow. I have a hole cut in the top for the siphon tubing and another hole for air relief.
These containers may be too small.. we'll have to see. I think as long as it is draining and I have the siphon flow adjusted right it will be ok.
I still don't have an idea for hanging the overflow box on the back of the tank. I could use suction cups but that will look awful cutting through the background.
I'm done until tomorrow... tiring day