Need a SUMPP

Hey guys i was wondering if anybodody had a sump just lieing around. I have a 100 gallon tank and my 20 gallon sump just wont cut it...im running vertex in180 skimmer and it pretty much takes up all the space. Im growing chaeto so need the room. I can fit a 36 X 12 under my tank. So lemme no if anybodies got one i wuld really appreciate it. Free or really cheap ill come grab it Thanks for lookin