I know someone here in Missouri that has a 300 gallon for sale. It is acrylic and it doesn't look like many scratches and the faint ones that are there dissapear once water is in it. The back of the tank is the filter system but it is empty (it's all one unit). You would fill it with whatever filter material you want to use. It has several stages and looks like a skimmer or two in there that might be run by wood airstones. I think he's asking $900 or $1000.