I too once had a diamond gobi. no harm was ever done by him to other inhabitants. he was a real pleasure to watch, he actually made a home out of a large conch shell. he escavated out the sand from under the shell, piled it on top of the shell, and when the lights turned off he would dive in to the sand and sleep under the shell. the only thing that bothered me was that i had to dust off the LR
everyday from all the sand he would sift onto it. other than that i loved my diamond gobi for the time that i had one.