i know you are looking for one that has been in a n established tank, but ARC in buffalo usually has one or two in stock and when they do they have them for a long time, you may want to give them a call and see how long they have had their current ones, i know they always have beautiful healty achillies in that store,, me personally i got mine online when they were very hard to find, i have had mine for over 2 years, and it is doing great so dont be afraid to order from a reputable dealer if it comes to it, if you want info on where i got mine you can pm me, but if you must i would deffinately reccomend arc