Mushrooms will definitely sting SPS. At least they do in my tank. I have even had zoanthids react very badly to touching a mushroom. They seem to have a more potent sting than you would expect...
Xenia will try to overgrow SPS but does not sting. Hammers can put out very long streamers and are pretty easy to see. They could easily reach 6 inches or more.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum