Seller has Oil Tank on property that needs to be 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 of $170k for a 4fam 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 or just accept the $5k credit?