sps

They won't. Not in all cases - in fact, never in my tank. :)
It depends on the particular SPS.
I've had Xenia (pompom) touching several SPS in my tank for months until I got the time to putz around and trim them. There was no damage done to any of the Acros (millepora, prostrata, tenuis) or the Pachyseris and Montis.
 

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