crab info

[zeddy]

i found a couple crabs in my tank lately. one i have identifyed as a coral crab but cant find desent info on them was wondering if someone had a good sight for this stuff. number2 i can see well enough to tell what it is all i can truely see is beady red eyes and is kinda grey in coulor. i know iding is almost imposible without pics thats why i need a good sight to find these things ty for your help