You have two tiger barbs in your fish tank They are chasing each other circles and than there lips locked Are they mating?

It is possible that your tiger barbs are mating, a behavior known as spawning, but it can be challenging to determine their intentions solely based on the actions you described. Here's some additional information to consider:

1.Spawning Behavior: When tiger barbs mate, the males will chase the females around the tank. The female will then release her eggs, and the male will fertilize them. The eggs will attach themselves to plants or other surfaces in the tank.

2.Coloration: During the spawning process, male tiger barbs may display intensified colors and patterns to attract females. Look for vibrant red or orange hues on their bodies.

3.Courtship Rituals: Before spawning, male tiger barbs may engage in courtship rituals, such as swimming side by side with the females and flaring their fins. These rituals are meant to impress and entice the females.

4.Duration of Spawning: The spawning process can last several hours, and the tiger barbs may repeat the behavior multiple times over a few days.

If you observe sustained chasing behavior, intensified coloration, and courtship rituals along with the lip-locking you mentioned, it's likely that your tiger barbs are indeed attempting to mate. Providing them with suitable conditions, such as proper water quality, appropriate tank size, and plants for egg attachment, can increase the likelihood of successful spawning.