Does the propane left in the tank belong to us or the sellers?

We just bought our first home and the sellers have now (almost 2 weeks since closing) told us that they are getting a refund for the propane left in the tank and that we will have to pay the gas company for the propane left in the tank. This was not brought up anytime before signing the contract. Do they have the... show more We just bought our first home and the sellers have now (almost 2 weeks since closing) told us that they are getting a refund for the propane left in the tank and that we will have to pay the gas company for the propane left in the tank. This was not brought up anytime before signing the contract. Do they have the right to do this, or is the propane ours?
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