The overflow box is inside the tank, and is just that, a box. There are little slits at water level which the water runs through. They are about a quarter inch wide about every half inch. They are about an inch tall. The water flows down this box, through a bulkhead in the bottom and drains into the filter.
Yes that little circled piece of pvc
is the return. That pvc
is connected directly to the bulkhead in the bottom of the tank. We could easily put more pvc
in there and run it up to the top of the tank (who knew you could only buy 10 feet of pvc
at a time!). We've even got that tall piece of coral which probably was used for that exact purpose.
Looks like it waiting for diaster to happen
Why? I don't live in the boonies where the electricity goes out all the time. I love in a big apartment building where even if the entire city of boston lost electricity, my building has got generators to last a couple hours. Let me tell you though that the chances of an entire city losing power(barring god coming down from heaven to smite me) is pretty slim.
If its a structural reason, then thats different.