A few weeks ago I found my acan frag on the sand bed with two of the polyps having been torn from the skeleton. Today I have found my frogspawn coral skeleton in the rock work where it's always been but the heads have somehow detached and in the sand below despite appearing in good health yesterday. Has anyone got any ideas what could be causing this? I previously suspected my tuxedo urchin.
Stock is 2x Picasso clowns, mccoskers flasher wrasse, silver belly wrasse, purple firefish, sunspot goby with pistol shrimp, cleaner shrimp, conch, trochus snails, red leg hermits, red starfish (fromia?).
Any help greatly appreciated!