What am I going to do ???????????

Last weekend, I set up a small fish tank. I keep some small fishes and aquatank plant.
But it looks not very beautiful like others.
Their corals and reef are beautiful. I can't afford it. Their tanks are looks more brightness and blue . What did they do ?
I want my tank looks more colorful and fishes more lively. What should I do ? Except those pampered corals and fishes. Any suggetion appreciated. Thank you