IME Xenia, clove polyps kenya trees, and mushrooms seem to be the most complained about, and rightfully so. they spread fast and are hard to get rid of once they start reproducing.
but others like GSP (IMO) are beautiful, and seem to be easy to manage, I keep my GSP on a separate rock by its self and if it decides to start growing into the sand I just lift it and trim that bit off every month or so. I think its in the eye of the beholder, if you like it its up to you, but just know that certain corals will take over eventually. Even some sps (apparenlty Poccilipora) will drop babies similar to kenya trees, that just pop up everywhere. so there are definitely "nice" nuisance corals in everyones tanks (almost)
Even Zoanthids pop up in weird places, I have some popped up in my tank, that I thought I had lost lol.
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I'm not 'fallow' you must be talking about my tank!
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