I want to add some additional water volume, better filtration, and a safe place to grow some beneficial algae to my "all in one". I am running into some issues trying to figure out a good way to get the water from my tank to the 10G that will be sitting below it. The picture below shows how the "sump" on this tank is set up. I really hate the design because I cannot clean this easily. Water overflows from my tank into chamber 1, then overflows at 2 and 3 to chamber 4 where the tank return pumps are. I've been trying to think of a way to do this both with and without drilling holes where I pull the dirty water from the 1-3 area then return it to 4, but I'm at a lose. Is it possible/a good idea to have a piece of PVC overhang the back of the tank about 4 inches (supply line @ chamber 2) and the return pipe do the same but 3 inches (return line @ chamber 4) into the tank? I'm thinking that this would cause a siphon from the tank into the sump, which will have 3 chambers, through the supply line. I'm also wondering if there is a way to make the Return line @ chamber 1 so I can use this bubble trap instead of building one into the sump? Any input and advice would be greatly appreciated.