NJ Investors! Have you ever had to have an oil tank removed?

[Walmsley Gedeon]

Seller has an Oil Tank on property and wants me to know he doesn't have the money to move it. He is offering me a $5k credit on the deal of which I am already paying a bit more than I wanted to for a buy and hold in Irvington, NJ. I already have a 5k concession on the deal. Should I go even lower on the price? Have any of you had to remove an oil tank before? How much did it cost? What should I do here? Because I don't want to inherent a problem child.