sir patrick my tanks a 120 gal with about 100lbs in the tank and about 15 - 20 in the sump right now. this is what the filter looks like now... after it goes threw that sponge the protein skimmer pump is right there and so are my return pumps...i wanted to silicone a piece of plexy glass about 5 0r 6 inches to the right of were the sponge is and put some sand and chaeto and more live rock...

photo1 - Adding a chamber