How to give fish privacy in a fish tank

Overview
Fish are naturally frightened by predators in and outside of natural bodies of water and they still hold the fears in a fish tank. They need somewhere to hide if they are flighted, shy, having sex, bullied by other fish or have human kids who keep on prodding the tank.

What they need

 * 1) Aquarium Plants
 * 2) Aquarium Rocks
 * 3) Aquarium Ornaments
 * 4) Driftwood
 * 5) Terra Cotta Pots
 * 6) PVC Piping
 * 7) Artificial coral
 * 8) Heaps of shells