Originally Posted by reefreak29
did u change your lighting recently, sometimes more intense lighting can turn your corraline white
yes i have noticed that with mine. I upgraded my lighting and my coraline is turning white. Will it ever go back to normal. I also noticed that blue/green algae grew on the dead white coraline.
But to help answer the question, it could be a sponge. I have seen sponge growths before and they were whit as anything.