This crab has been in my system from the very start. It has survived living with triggers and other invert munchers because of it's rather inventive place to set up a home - on top of the overflow!!
Having said that it must be smart because it's a female!! You can actually see the apron under the carapace fully open in the photos. It is a pointed triangular shape in males and rounded in females. The photos below show the crab itself and a shot above the weir and then a shot from just under the water level by the weir. The crab actually lives inside the holes on top of the overflow, it used to fit in them easily, now it does something houdini would be proud of as it squeezes through them.
a view from the top of the overflow and her favourite spot
a view from under the water where the water filters through the algae then into the overflow
