5 gallon tank

[JJ"sSouthernAquatics]

I got a 5 gallon tank with a yellow watchman goby and 6 nasarius snails and a couple zoas, a flowerpot (just keeping it in there for my dad when he gets his reef tank set up), and some macroalgae. Is there any other fish/inverts/coral I can put in there? I know I could put a pistol shrimp in there, but is there anything else? TIA

 

[blaxsun]

From a fish standpoint, maybe one other small fish.