Yes, no guarantee a nem will stay put. I've been fairly lucky but there has been unwanted damage. Someone with pricey sps will not want to take a chance I reckon. I'm ok with a predominantly softie/LPS reef and don't mind some of the oft shunned nuisance coral. I think Kenya's are pretty cool actually. I like the shape & growth patterns they have. Reminds me of one of my other hobbies, Bonsai. I simply look at controlling their spread as occasional tank maintenance.
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