I purchased a yasha goby and a pistol shrimp about a month or two ago and they haven't paired up which is driving me nuts. The goby is in the back left corner of the tank and the shrimp is in the back right. I've tried adjusting the feeding to move them both out of their spots and some other tips to no avail so I'm looking for some any other success stories of people who have gotten their stubborn pairs to actually pair up...