Several years back,I picked up a beautiful 265 gallon setup,It had all the bells and whistles,uv,titinium heater, rainbow life guard modules,quiet one pumps,Monster twin tower wet/dry filter system,custom acrylic sump,with a huge downdraft skimmer with external pump,,I picked it up for basically nothing....The man could not keep anything alive in it,water he had it tested by almost every hobbiest and shop in the area,,,I picked it up then showed him the problem after I had the tank.....Someone had used a couple of the wrong metal fitting to hook up the filter on the tank ,,,,,Moral of the story is ,check your plumbing out on your tank,Then check the tank for stray voltage......My two cents..does everything dying mean just inverts or fish,or both.....Need more information,If I did not know any better,I would say that it is a scam It sounds like a great way to get a tank cheaply......Someone offers yet you don`t take,Makes me wonder