How big is the tank? Doesn't quite look big enough for tangs from your pics. Clownfish although they are really common, they are a great fish, very entertaining. The size of the tank will determine who/what you can keep in there. For instance I have 7 small fish in a 55g. Check out liveaquaria.com for suggested fish sizes and compatibility. What type of lighting do you have? That will determine the types of corals you can keep. I would suggest start slow, with fish only. Give it time for the tank to settle in and for you to get used to the maintenance, some people suggest waiting about 6months before adding corals and you will need to start testing our water for a few extra things when you do. Got any powerheads for movement? Thinking about a skimmer in that sump?