:happyfish
The 4 I have are VERY SHY! When they see myself or our 4 year old they freeze! Most of the time they are hiding out between the LR eating green alage! Today we saw one down on the sand bed! I think the are very neat looking also!
the emeralds are just cleaning. they will not eat your coralline. They will eat bubble algae though (green0 i have 2 emeralds and the big one always stays in sight...but the smaller one is no where to be found.
aaron
I have two Emerald Crabs in my tank and they are very bold! They like to knock over coral and rocks in the tank (maybe on accident) and I have been pinched by one while fixing their undoing. But, they are good cleaners if you can deal with a little destruction.