I just put in a Colt Coral about 45 minutes ago, & my Elephant Ear is not a happy camper. His mouth is very open (never seen him do this, BUT the lights went out about 1 hour before I started acclimating the Colt, so maybe that's normal??).
When I put the Colt in, it may have touched the mushroom a bit...the Colt is on a teeny piece of rock & it fell over...not sure if it touched the Elephant ear or not.
The mushroom & Colt are not near each other (the Colt is about 6 inches away...)
I have about 8 kinds of mushrooms in the tank, & the Elephant ear seems to not be happy. Others have their mouths open, but not HUGE...