Acan Ech.

IME, they do put out sweepers, but not really long like euphyllia. They are quite agressive if they get a hold of something though. They put out this mucus too and if it touches something the polyps guts reach out along the mucus to eat whatever it's touching. Here's a pic of my rainbow trying to eat some kenya tree:

normal_IMG_2126edit.jpg


Just give'em some space and you'll be fine.
 
It's a lousy pic, but here's my little guy attacking some nearby zoas. The zoas reopened a few days later, and I haven't seen the acan sting them since; they seem to have come to some sort of understanding.

HHsweepers.jpg
 
I agree with clkwrk. I had a lord fall on one, it was only there for a couple of minutes and it ate a hole through the lord.
 
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