Compatibility 30g tank/10 g

[newreefer.2]

Hi,this is my first saltwater aquarium,I bought 2 clownfish,both eat,seem fine,they are curently in my 10 g but i started working on a 30 g so i can move them there.I was wandering if i could add some fish ,since is my first aquarium,tis bill be an only fish tank.would these work togheter?

Diamond Head Goby
[v] Clownfish ×2
Cleaner Shrimp
Royal Gramma
Dartfish
 

[seabass]

A Diamond Watchman Goby is a pretty big fish (about 6") which feeds by sifting through the sand.  I know that a number of sites recommend at least a 30 gallon tank; but I'd say that this might be a little small.  You might need an attached refugium full of fauna in order to properly support one in a 30 gallon tank.  I might choose a smaller goby like an Orange Stripe Prawn Goby.