20 Gallon Rimless Help

[Dirtysouthreef]

So I'm starting my first nano, a 20 gallon rimless. I bought this tank off a guy and need help with identifying what goes in the 4 chambers on the back. It actually has 5 but the one next to the chamber where the water enters the filter area is 1/8 the size of the others.

So what goes where, and can anyone identify the maker of this tank (pics included.

Thanks for any help given!

 

[thegrun]

A couple more shots from different angles would help.

 

[Dirtysouthreef]

More angles of filter

More angles of filter

I hope these are better. filter box along back has 4 chambers (intake, return, and two others). Also has a slender glass divider right beside the intake that is about 1/8 the size of the other dividers for compartments. I'm guessing one is for pump, protein skimmer, heater, not sure what else.

Thanks,