my lfs has several used cans for sale , the good news is they are all running and have full media, the bad news is they are all running on a tank that is stocked with pleco's and goldfish... I am paranoid about introducing parasites into my aquariums ... what do you guys think, buy and use as is ... buy and sterilize( I am not sure the savings involved warrants this ,xp3 $65 ).. or just avoid these filters .... thanks for your responses