I have an allglass megaflow 4 sump. This is agreat sump that uses filterpads rwther than socks....which realy did a nice job polishing the water wnd is far less maintenance than socks imo. I didn't have the heart to drill such a fine sump for a 2" bulkhead. Nothing wrong with it at all. It is used, but fully functional. This sumpmis rated to 225 gallons tanks and 1500 gph flow.