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

[Aquattro]

Let's be realistic. If you just say no, the buyers are probably not going to walk away from buying a house they want. Just simply define that regardless of what law says, the fish were your pets and you found them an appropriate home. That's all you're going to say about it, like it or not.

If they want to insist, toss a damsel in the tank.

Or, tell them to FO, and cancel the transaction.