Hello I have a 90g reef tank and i have a tang, fox face, a clownfish, and 3 chromis. They all stay together toward the right side of the tank where i feed. How do i get them to separate and swim throughout the whole tank. They have been in the tank for around 3 months and all added at separate times. And how do I get the fish to act normal when i and others look at the tank so their not all bunched up on the right side awaiting food??