thank you all for the input very much appreciated. Ive been flat out with work these days and i will get a better picture once they come out at an appropriate time. cheers
well i cant get a photo. sadly both of the crabs died and i would say this was due to the fact that they had no access to their natural food source. i tried feeding them various alga's from my refugium but they didn't seem to take to it. thank you boomer and lesleih for your contribution.