I know this is off subject but I wanted to get an Emeral crab but was told that they eat coraline algae is this true?
As for everything its a 50/50 chance. Mine may have just been "scraping film algea off of it" as stated by mlm, but it just got out of hand for me. I had white spots left wherever it went, and the rocks looked aweful. Since has been returned.
That being said, lrswls, that is how I always found mine.....just looked for new "cleaned" spots. But it was a good hider, drove me nuts!