I'll post some more later but I just checked everything and it all water tight. So all I have to do now is lay out the return line.here are a few pic the first is the unit with the top on.
And this is what I'll do on the inside. I had some bio balls and poly-fiber
I took the precut egg crate and laid the poly-fiber between two of them
and cut around it. I wanted to keep it as thin as possible to make sure it doesn't clog easily and placed it on the bottom of the tube
The next layer is the bio-balls that will do most of the work
And another layer of poly-fiber
So I'll post the return in a bit.