Legal question:Selling house with built in tank, are fish pets?

[Seth81]

Hello everyone,

So I am selling my home to some people. The tank has plumbing that goes through the wall to the basement sump. The buyers at first indicated they wanted the tank removed, so I sold all the livestock so that I could shutdown the system. My lawyer recently told me the tank is considered a fixture and therefore must be left for the buyers unless they sign an amendment.

Buyers wont sign the amendment now, and now that the livestock is gone the lawyer is saying I may need to replace the fish.

I disagree and am looking to see if anyone on here has any legal background that can tell me if the fish needed to be left for the new owners. I have tried my good friend google but can't find an answer.

The way I see it is that fish are pets, and no one would reasonably expect my cat to be included with the home! so why the fish?