If you'll look at the top of the page,you'll see a tab that says Articles.
Take the time to read them.Then read them again.Dont read,STUDY,them.
Research is your best friend in this hobby.
You've to understand the water chemistry,the habits of the animals and how they interact together,how the filtration works,how the corals get their nutrients and grow.
Theres a lot more to it than just putting saltwater,sand,and rock in a glass box.