Taking pictures. How to make them clear??

[banditpowdercoat]

OK, I see alot of your pictures and I have to say AMAZING. Not only the beautifull corals and fish, but the clarity and closeness of the shots. Whats some secrets? I juat have a Sony Cybershot 5.1 megapixle camera. I can set some F stops ets, but I have NO CLUE when it comes to that stuff. And takin pics on Auto makes it flash, and bleach out the tank. Shut flash off, its all blurry. What do I do??