[i have crabs]

i bought some marshal island's rock from red coral and the first time i didnt put the rock in the qt tank first i get a surprise, i put the rock in and a couple hours later i looked over and he was sitting at the front diggin in the sand, ive bought hundreds of pounds of rock over the years but never had one before so not very common i wouldnt say, ive had a small mantis in a 7g tank once and thier great pets i wish i had a spot for him but he cant stay in the qt forever