ok, this is new, i just noticed this little shrimp about a hour ago. ok i have a good sized acropora colony and in that colony was 2 acro crabs, now i have noticed that there is a little (but slightly larger than the acro crabs) green shrimp. it appears to live in the coral. it is green like i said and somewhat see through, is it bad, good, or harmless. thanks for all help.