I think I've talked my wife into getting a "nice" tank. Every sw tank I've ever owned has been a 2nd hand purchase. Have been looking very closely at the Red Sea tanks. The 170 seems to be the right size for the room and I think I have a line on a good deal. Seems the the sump on the E-170 is an optional add on, but can't seem to find much info other than YouTube vids about installation. Does anyone here have an E-170 that would be do kind to share their experiences? TIA!