Clicking In Tank?????

nope...its def. not any type of shrimp. Its body is the same as a emrald crab, but it has black and white markings and red eyes and pincher tips. It refuses to vacate a hole its in. it just picks algae off the rocks around the hole by streching out an arm.
 
There are several species of Mithraculus that look like emerald crabs. Most have the same habits. Do the pincers look like spoons at the ends, or are they pointy?
 
Also, in terms of clicking, depending on how loud, and stuff.
My hermit crabs can make a clicking.
They are so clumsy, sometimes when they walk near the glass, their shells hit it, and make a light clicking sound. Hard to explain. i'm sure people who have hermits know what I'm talking about.
 
Jaydee - sounds like the type of crabs ive got.
(In my tank i mean :P)
I have two that dont come out - just move around the cracks in the LR, and one chops off bits from around its main hole.

I thought this was all i had - but after my tank cracked and i had to move everything guess what fell into the bottom of the box i put the liverock in for transport?
MANTIS SHRIMP!

It now makes me think i might have more...

Anyways try this - if it doesnt work then you can be pretty sure your crab is the clicking culprit.
Get something appealing like a couple decent chunks of shrimp or similar.
At night, when the lights are out and the room is as dark as possible, drop the bits of food down into the very front of the tank. Sit and wait with a torch at the ready, and see what comes out to eat.
If Mantis appear - shine the torch on em - apperantly this blinds them and they wont move for a short while. Quickly scoop it up and do what you will with it.
If no Mantis come out then you can start breathing again :P
 
good advice! I've been mantis hunting w/ no luck yet.
After all the reading I've been doing on them. I may put it in its own tank if i get it!
 
If you can see which rock/s it/they are in - you can grab the whole rock out and freshwater dip it to get him off the rock too.
I dont know, however, what this does to other organisms on the rock.
Some others here might be able to tell you.
 
Brief exposure to FW shouldn't damage anything but sponges, but a better method is to locate the hole the mantis is in, and use a baster to squirt the FW just in that hole. This way, the entire rock isn't exposed, and the mantis usually comes out quickly--have a bowl of tank water ready to catch it in.
 
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