So, funny story. Yesterday, my new emperor angelfish decides to scare the heck out of me and taste literally everything in my tank. I MEAN EVERYTHING! He nibbled at SPS polyps, LPS polyps, sponges, algae, live rock, sand, effluent plumbing, asterina starfish, zoa polyps, cyano, you name it... it took a test bite.
Funny thing is, no damage whatsoever, other than a couple of really scared SPS polyps. Even better, after testing everything, he stopped nibbling. It seemed like a more aggressive version of what my old rabbitfish did... just testing everything with his mouth first... a fish version of feeling around.
I wasn't so worried about the SPS polyps honestly... because if he spent all day nibbling at them, there's enough in the tank for him to spread around the damage and not really cause much damage at all.
I was more worried about having to give up the few LPS that are allowed to stay in my system or the zoa polyps that started my whole coral crazy in the first place. Let's hope he's done "testing".