Here are a few pics of mine. I thought that it might help some to have a visual.
We took a 29G tank and made our sump. We used plexiglass that my husband cut to size and we siliconed them into place. We used eggcrate to hold the rock. I the middle is live sand, miracle mud, seaweed and our heater. On the end is our pump.
Our pump is actually a pond pump. The others we were looking at didnt really do what we wanted.
Here you can see our skimmer and the light, which is on all night and off during the day.
This is the PVC tube that direct water into the sump from the tank.
This is the tubing that comes from the back of the tank into the sump. And you also see one of the lines that is going back into the tank from the sump.
This is the vavle that helps us control the flow rate from the sump to the tank.
See the black thing in the back (it a little blurry). That is our water current director. That nifty little thing keeps a nice flow in our tank. Before the water enters the tank it passes through this and it derects water to either side of the tank.
This is the right side of the tank. The two pipes with the holes in them is where the water leaves the tank to go into the sump. The other pipe is on of the two places that the water enters the tank. (sry 'bout the glare)
This is the left side of the tank and the other pipe where the water re-enters the tank.
I hope that this helped you out some. This is just one way to do a sump. Its working great for me.