Has the tank been cycled? Did he quarantine? If no for both, I don’t count on that lasting long…
Doesn’t look like it’s been cycled long (I’d just expect it to look a lot dirtier), but I could be wrong. I very much believe that in marine tanks quarantine cannot be avoided. I lost a lot of fish because I didn’t.
So far the stocking seems fine but I wouldn’t get any more, no more than 4 fish in a tank that size. Clown pairs are 50/50 in small tanks. Sometimes it works, sometimes it doesn’t. In my experience the female rejected and killed the male.
Watchman is good, but I’d get a pistol to go with it.
Chromis is fine, just watch as they are uronema magnets.
Looks like a mocha and an occy clown. Designer clowns are supposed to be very aggressive compared to wild type, so I wouldn’t be surprised if down the line it becomes the female and kills the male. That’s what happened with mine.
I agree with the goby/pistol shrimp combo. Here's a cool fish that you could possibly put in there instead:
https://www.liveaquaria.com/product/1483/?pcatid=1483
I have no saltwater tanks and really want some of these, so I could live vicariously through you lol. Not to be confused with Gobiesox, which use the same common name "clingfish," and are very different. I have posted about the latter before
I like those guys. Very bad beginner fish though, as they are very much like seahorses or dragonettes in their dietary needs. They need very mature tanks to thrive.