What has a tank but isn’t a military vehicle?

Riddle Explanation:
The riddle, “What has a tank but isn’t a military vehicle?”, cleverly refers to a fishbowl or more specifically, an aquarium tank. While “tank” often brings to mind armored military vehicles, in this context, it refers to a water-filled container that houses fish. This riddle plays on the multiple meanings of “tank,” making it a fun and thought-provoking puzzle.