Keeping fish as pets is a common practice and can be done humanely with proper care and consideration for their well-being. Providing a suitable environment, proper nutrition, and regular maintenance of their tank are essential for ensuring the health and happiness of pet fish. It is important to research the specific needs of the fish species you are interested in keeping and to set up their habitat accordingly. When done responsibly, keeping fish as pets can be a rewarding experience for both the owner and the fish.