When I was snorkeling and underwater i saw an akward looking fish that looked like a mix of a srimp and a lionfish. It was about 2.5 inches long had all the black stripes and brown color to it. But it also had long shrimp-like legs and when i swam over it it took off so fast it made me jump. The speed reminded me of a hard shell crab, but faster. Also a strange thing was its fins were rounded off instead of the spiny fins of a lionfish. So any help of what it is whould be of great help.