Not sure if anyone can use this but.......Just upgraded my lighting & filtration, so I have an Eclipse 3 Hood w/ Bio wheel & 2 week old Smartpaq retrofit 65 watt 50/50 Lamp (10,000K/460nm Actinic) I believe this will fit a 20, 29 or 37 gallon. The footprint is for 30x12. $40. or trade. Or if you have a cheap 20, 29 or 37 gallon for sale, I may just keep it & use it as a quar/tank