scolymia, trachyphyllia and Acans atacking eachother

[dcom]

Hi,
I've seen videos were lobos and scolys lye next to each other and I really like the color contrast but in my experience, whenever closer, these corals attack each other.
In two separate occasions my snails or fish had pushed an acan and a trachy next to a lobo and the lobo has digested part of those corals tissues. I've lost a piece of the acan and a big chunk of the trachy's head.

For now, I've placed epoxy rings to prevent them for touching each other.

 

Is it just this single lobo that is so aggresive? or should I definitively maintain a good distance beetween all of these corals?

PD: in the pictures, the circular purple/green piece is the killer. The other two are its victims.

Thanks

[J-Ranko]

LPS in general tend to be very territorial (some more so than others). Any prolonged touching results in injury/necrosis.  You can keep them close but it's a risk if, as you experienced, some fish or invert knocks them together to cause physical contact. I give my LPS some space. My only worry is SPS frags falling into them from above (usually my hand clumsily knocking things over). 

 

 

[dcom]

Thanks.

Will keep them appart from each other then!