Just so you know a 30g is way to small for a scopas tang, they need at least a minimum 80g tank. He will add a lot to your bio load and mostly likely cause a lot of algae issues, water quality issues and mostly likely stress himself out and the other tank mates from being in to small of a tank.
Here's a link
http://www.liveaquaria.com/product/p...381&pcatid=381
They actually recommend a minimum of a 125g which was surprising to me as I usually find that sites tank size recommendations usually on the small side.
Also looks like you could use more live rock in your tank, most of what you have in the tank is dead coral pieces or barnacles which do nothing to help filter the water. Kinda looks like you have only 2-3 pieces of live rock, try to aim for around 20-30 pounds of live rock.
here's your 1st pic for you
