9. Kissing Gourmis
Kissing gourmis are better known as kissing fish because of how they lock their jaws. However, while many people like to think that they are kissing, the action is actually how kissing gourmis spar with one another. In fact, the “kissing” can potentially result in dislocated jaws.
Kissing gourmis require large aquariums of at least 85 gallons to thrive.