Distance between different types of Coral

[Braveheart!]

I’ve heard the rule of thumb is six inches between different types of corals. I currently have zoanthids, acans, Frogspawns, a toad stool, hammers and a Duncan corals in my tank. I’m wondering is six inches more of a guide line or hard rule. Thanks. I’m currently following the rule. Lol

 

[fishski13]

It all depends on which coral as some corals need more space than others. For example some acan have sweeper tentacles that can reach 6 inches while others don’t. Also some corals need more room to grow as they grow faster than other. I think distance between corals should be based on there specific aggression and how fast they grow.