hey i had my tank running for about 1 year and i recently took it down (aiptasia) and build it back up i just cooked all the rocks with aiptasia saved the live rocks pest free. ive observed my live rocks for 2 weeks flipping each angle and corner once every 24 hours to see if the rock has aiptaisa. my new tank has been running for a month and now i found this litter monster what the h`ll is he? he looks like a stone cold survivor !!! in my whole tank live i have never ever bought a crab nor have i seen this crab