I think that guy's asking WAY too much for it. Look around. I'm sure you'll be able to find better deals. As well as a 400 gallon tank is pretty big. Do you need one that big?
Thats kinda what I thought, and yes, 400 gallons is WAY too big, more than I'll ever need. I like the size of yours, where did you find that? Trying now to find an old air compressor tank, but dang their expensive LOL