corallover- i'd just do like veni vidi vici said. basically, go to your LFS, and look how they have their tanks plumbed together. you'll see the elbow with the strainer in the back. that's how i have my frag tank set up.
i woudl not recomment hang-on overflows. they are about 95% effective- this leaves a 5% margin for error. and error spells big trouble when you are dealing with a tank full of water, running expensive pumps, and carpets.....