I was just wondering what inverts you have that won't go on the rocks -- if they are sand-dwellers, or if they're the type that usually are on the rocks and they're avoiding the rocks. Maybe there is cyano or something on the rocks they don't like.Don't really know what type of algae it is. Some red, some green, some hairy, some not.
All the inverts that are meant to be on the sand are doing their job, it's just the rocks.
And there's some algae on the glass which is really difficult to shift. Do urchins get on the glass??