Is the stand metal or wood? My question has nothing to do with the capability to hold weight but is a attractiveness question. I had a 180 once with a metal stand and it needed to be upstairs for the first year. Not attractive in the living room. I got some thin wood panels, put magnets on the back of the panels and stuck the panels to the front and sides of the stand. It looked better than the metal.
Well, I think I answered my own question. Right after I made my last post it occurred to me to look up the part number and it looks like it is made by Aqueon and is rated for their 180 and 210 gallon tanks. I am sure it will hold a 220 gallon tank just fine.
It is a used tank so I doubt that the factory will give any kind of warranty on it. If I am uncomfortable with how sturdy it feels then I will add some additional supports.