2nd time I've found one of these guys in my tank. Nothing wrong with the tank everything looks awesome. I have been using NSW for water changes (northeastern MA) and someone in my local club thought it might have been elysia hedgpethi, which is a sea slug that eats algae. Any thoughts or other possible IDs?
And if it is elysia hedgpethi are they reef safe?
And if it is elysia hedgpethi are they reef safe?