2 Gobies 1 tank

[Young347]

So I just picked up a diamond watchman gobie and he is freakin awesome lol I want to know what about getting a sleeper gold head goby also??? My tank is 150 gallon 48 long 24 wide or will the 1 goby be enough to get the job done on my whole tank I do not want any snails and just found out crabs are not good for a reef tank I have 2 shrimp I think I might get 2 more shrimp idk yet