Questions regarding mantis shrimps

1) What eats manti shrimps?

2) Are they reef-safe?

3) Are the even useful to our tanks?

4) What are the chances it will smash your tank?

5) Will it die due to starvation?

6) Is the clicking sound an indication of their presence? Could the clicking sound be given out by other stuff?


heard some clicking sounds since i bought my lr. haizz...i did not nuke the rocks.
was contemplating whether or not to tkae the rocks out and nuke them.

pls advise bros~