My girl just got a yellow watchman goby for her softie tank. It's a nano 15 gallon. The only other thing in their besides coral is a cleaner shrimp. Little jerk already made his way into the back flow. I got my 30 gallon reef tank on the other side of the room. Should he be fine in the 15 by himself with the shrimp? Lots of hiding space and it's got a deep sand bed