Why do angelfish kiss?

Angelfish do not kiss. They engage in a behavior known as "lip-locking," which is often mistaken for kissing. Lip-locking is a dominance-related behavior observed among angelfish and other cichlids. It involves two fish approaching each other with their mouths open and attempting to show dominance by pushing against each other's lips. The fish may lock their lips together for a few seconds, and this behavior is typically observed during territorial disputes or courtship rituals. It's important to note that lip-locking among angelfish is a natural behavior and is not harmful to the fish.