What do fish eat?

So I was at the hospital waiting for the doctor to come.

You know how most hospitals have gigantic fish tanks everywhere? There was one right next to me and a little boy about three years old and his father were looking at the fish.

Suddenly the kid goes " Thaththi.. What do fish eat? Don't they get hungry?"

Dad says " People give them food kiddo, they don't go hungry"

kid: "aaaaahhhh... "

Thinks for a moment and says " Ah that's good neh thaththi.. So easy for them.."

Dad: "Why putha?"

Kid: "They can eat and drink water also.. ".


I almost fell out of my chair.