Okay cool thats what i figured , just wanted verification. Maybe the goby is just hidingEmerald crab, can be good if there is algae to eat or leftover food.
Claws had black tips didn’t get a good pick unfortunatelyLooks like a stone crab to me. Need to see his claws but if it is, that is where your goby went. Emerald crabs are mostly green. Stone crabs are more orange with black tips on their claws. They are night time hunters and will get your fish while they are sleeping.
Yeah just more curious than anything.Doesn't matter as long as you didn't release him back into your tank.