Symbiotic crabs and corals?

[Gdevine]

I have read that there are a number of very small crab species that have a symbiotic relationship with a number of various corals. I purchased an Open Brain some months ago and have witnessed a very tiny crab that lives in one of the folds and seems to be very happy as does the coral.

The relationship seems to be that the crab “protects” the coral from predation and in turn the coal let’s the crab "live" within the coral to scavenge for food.

How many of you have witnessed the same?

 

[psteeleb]

one of my acro's has a acro crab - it's pretty common