I read an online article (I wish I could find it again) regarding coralline growth. The article described hermits as a major cause of what hobbyists think is coralline erosion.
In the article he expressly mentioned (this is what made it so memorable at the time) that blue-legged hermit crabs were less likely to eat coralline so if you MUST have hermits, the blue-legs were a good choice.
Keeping this in mind, I have read numerous posts about hermits and coralline trying to determine whether this theory was true or not . From personal experiences shared in the posts, I have come to believe that all hermits are capable and perhaps do eat coralline.
As an experiment, I have ordered small microhermits from
www.ipsf.com. I will isolate them with one piece of rock to determine if they eat the coralline.
Other than this experiment, I have decided to keep a hermit-free tank, utilizing other non-chemical methods of algae control.