Yes. This is Mantis shrimp. There are 2 types which in marine. Yours is colourful. Another type is just grey color which we can get in sea food restaurant.

You can keep only mantis shrimp inside a tank without any tankmate. But i did saw some members keeping it with bigger fish. They are aggressive and like to dig holes. Don't use yr hand to catch. You might cut by it's body part and you gonna seal the wound by doctor.

they attrack to the lighting or anything colorful thing. try to locate something inside the net n trap it.