I gave a tank to a friend, the only thing she added were the fish- guppies. I have paid her for snails from the tank, I have provided fish food. She is moving, I bought house plants from her but said I would not pay for the tank as I had given it to her. She thinks she's going to get $100.00. I told her I could give her $20.00 on the 31st. If she is unable to sell it. what would you do ? she can't take the tank with her.