just wondering how long before they hook up in the tank, the shrimp made his home right away, the goby went the other direction, its a 365 gallon 8 ft long, just wondering do i get him another goby, can i have 2 pistols in the same tank, any suggestions, the pistol is a tiger pistol, the goby is a tiger goby, theres another goby at the lfs sweet lookin should i get him or not??? thanks