![Picture](/uploads/4/8/1/0/4810798/published/mithrax-crab.jpg?250)
As well as doing a good job I also find theses little critters add a great deal of interest and enjoyment in my little reef.
My tuxedo urchins wander around the tank decorating themselves with anything that takes their fancy. Including small hermit crabs on occasion.
The cleaner shrimp and boxing shrimp are always active and fun.
I love to sit in front of my reef at various times looking for the little critters that are in hiding or only come out when my wrasse are bedding down for the night.
Here a large mithrax crab has found a hiding place beneath a mushroom.