is it ok for crocea mantle to touch sps?

as long as is not a harmful SPS such as Hynophora you are ok, if is not burnig the mantle of the clam, in whcih case you will notice as the clam will retract its mantle on that side.
 
well im talking acro for the most part, so hydno is bad , any others? i thought all coral stung , acros dont so much?
 
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