I've got a yellow watchman/tiger pistol pair in my 120g 4x2x2 tank. About a week ago I discovered the red banded snapping shrimp I thought had died 2 1/2 years ago on the other side of the tank from the YWG/tiger pair. Could I add a hi fin or dracula gobie with the hope he would pair up with the red banded shrimp? Would there be war between the two gobies or might they stay on their own side of the tank? I know it could work but I'm leaning toward not taking a chance. Anybody with experience with two gobies? Your thoughts are appreciated.