Sleeper gobies really need an established sandbed or they'll starve especially in a 14gallon..
get you a cool shrimp goby/shrimp combo... they're pretty fun to watch.
I'm partial to yashia gobies and candy stripe pistol shrimps.
My pair of yashias in the now sold biocube14, the pistol is hiding in there somewhere...
yeah there's some diatoms so sue me.. that was the only part of the tank with them lol, my tongan fighting conch was on the other side of the tank.