Knowledge: Salamon can be placed with other fish types in the same pond, whereas piranhas cannot be domesticated and live in their natural habitat.

Conversation:
I love koi ponds, I have one in my yard with a pet koi named Spot! Also, I am planing to buy a piranhas, so I will have 2 fish!
I see. The koi's pond design can affect the health of the koi.
Can I keep a koi fish and piranha in the same pond?

Response: No! piranhas are not domestic fish and only reside in their natural habitat.