Carnivorous, will catch small fish and shrimp, posing an immediate threat to shrimp. It is recommended to manually catch and move them outside the tank.
There are actually many types of dragonfly nymphs, and their appearances are very diverse. If you want to identify which type of dragonfly nymph it is more carefully, you can refer to the "Gomphidae Poster and All Dragonfly Nymph Poster" made by Names of Nymphs.
Gomphidae Poster and All Dragonfly Nymph Poster (Names of Nymphs, 2019).
References
Names of Nymphs (2019), Gomphidae Poster and All Dragonfly Nymph Poster. Retrieved from: https://www.facebook.com/namesofnymphs/posts/2604755866251169 (Accessed: 2021/12/1)