Typicly, fish of similar appearence will tend to have the disposition of not wanting to get along. Some gobies are known to steal Jawfish burrows and out compete them for food. Unless your tank is very large and the fish can separate themselvs from each other, id probably recommend not mixing them. Jaws are very timid creatures and dont tolerate agressive fish at all. Ive always kept them in a species tank by themselvs. My opinion.