System sounds good. Im assuming you just set this up? Have you cycled it yet? If not, let it cycle for 30 days or so, test ammonia until you have none.
Then add one fish. See how it does. You'll want to add more right away but just add one. If after a month your tank is doing fine, you fish and coral are still alive, you could add another.
Take it slow. Biggest new tank mistake is getting all excited and adding 3 fish together. You could have another cycle killing them all. You could have one bring in a parasite killing them all, you could add so much food and poop at the same time that your tank crashes or grows hair algae faster than you can get rid of it.
Slow and steady brings success.
30 gallons is good for about 3-4 fish all together. Any more and you could come across aggression or the bioload will be too high and things will start to die. I found my 50 gallon liked 5 fish total, any more and things went wonky.