I recently downsized my 20G reef tank into a 10G, and every animal and coral seems to be thriving except for my tuxedo Urchin. He's acting normal, tentacles extended, but one small section of spines appears to be missing.
My guesses are (1) that he's stressed and (2) that my halloween or one of my dwarf red-legged hermit crabs picked on him. Thoughts?
My guesses are (1) that he's stressed and (2) that my halloween or one of my dwarf red-legged hermit crabs picked on him. Thoughts?