You just cant pull up a number. It depends on the fish and the type of fish. Are they messy eaters? You`ll just need to post a list of what you want and let the members comment on if those fish will be OK. But there is no inces or fish rule in SW.
you should get more rock at least 1.5-2 lbs a gallon id say. as for that list, the yelllow tang is a no because of your size, i believe angels pick at corals so maybe thats not a good choice and i think all or at least most gobies are fine