Hey I got a problem with my shrimp and goby, They're not pairing up. I got this pistol shrimp(Alpheus heterochaelis) for a period of time and so I thought that "hey would it be nice if I add a goby" so I go and buy a yellow watchman goby and i Add it to the tank near the pistol shrimp and the pistol shrimp blast the goby and pouring out sand. Is my pistol shrimp a wrong type? (Sorry for bad english)