Pistol Shrimps

Our saltwater aquarium has pistol shrimps.  It is really tiny shrimps but pops really loud.  We can hear the popping in the whole house.  The shrimp usually the popping sound to stun its preys and then eat them up.  We also have goby fish and apparently they work as a pair to fence off predators.  I can see tiny sea anemones and also I caught some really tiny crabs.  Now I feel I have a miniature aquarium.