It Can Be Very Confusing-and Matching The Return Pump To The Overflow-in Sump Pump Or Outside Etc. Etc.
I Went Through The Same Thing, Then Visited An Extremely Large Saltwater Fish Store In Va. Beach, Va. Who Stocked Everything. I Told Them What I Had, What I Wanted And Left The Store With My Overflow, Sump, Pumps, All Connections And Super Skimmer For Around $700.
I Have The Tide Pool Sump, Sos Overflow, Mag 700 Submersible Pump And Euro Reef Skimmer. I Could Have Gotten All These Things On Line For About 1/3 Less Than I Paid For Them At The Store, But I Didnt Know What I Needed To Make It All Work, So Did Not Feel Confident Piecing Things Together.
I Dont Know If This Site Sells Sumps Or Not, But They Dont Have A Package You Can Just Buy With All The Pieces.
If It Isnt Against The Rules Here, Go To **************.com And You Can Order All The Items I Just Mentioned Except The Protein Skimmer.
The In-sump Skimmers Are More Efficient-get The Best One You Can Afford-the Tallest That Will Fit Under Your Tank!