Not really a problem at all... they're pretty benign. However, if they come into contact with SPS they can raise some hell and they can grow fast and might cover slower growing corals but really I think you'll be fine. I've never removed a paly from my tank and I'm sittin' pretty good. You never know, once you get some high light on those bad boys they might turn into something cool, that's what happened with some of my hitchhiker paly's.
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