How common are sweeper tentacles in corals?

I have always read to beware of them and that some corals need extra room because of them. I have a tank full of coral and I have yet to see a single one.
Some LPS corals have them, such as galaxea coral, they have sweepers that can sometimes extend 8" away.
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Euphyllia can run about 6”. Acans a couple of inches. Watch for them at night. Galaxea are often out all night long. They are very aggressive and seem to hate other corals.
 
Usually they’re out at night. However some corals do fine next to eachother hence why we often see euphyllia gardens.
 

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