Originaly I planned to use a 55 as my w/d for my 150G but decided to keep the tank and go with a cheaper alternative
heres pics of the w/d setup:
great filter, very cost effective, heres the parts list:
1 pump -most expensive part (mag1800 for my 150G)
Blue bonded filter pad
1 large plastic bin -clear b/c I like to see everything
2 small bins - stacked on top or eachother, drilled & filled w/ bioballs
6x9 media bag w carbon blend (to get the original tap h2o corrected)
PVC pipe (or you could use tubing)
[I made my returns two spray bars but thats just up to prefference]
the only thing is put a ball valve on every line, and a check valve on your return line.
hope it helps and id be glad to answer any questions