There is a fair ammount of algae in the tank. Its hard to see the algae on the rocks, due to the cloudiness and impossible to get a picture of it. There is also some brown algae on the substrate. Here is a picture of one of my hermit crabs wallowing in his field of algae Here is one I quickly edited, so you can see the algae a little easier. There is bigger patch of algae, about 10x the size of that one on the other side of the tank, but it was impossible to photograph. For some reason my camara wants to make everything a lot greener than it is. The crabs and snails really seem to like munching on the algae. There is also a lot of algae on the bottom of the sump. In the chamber with live sand, it looks like (from what I can see) the entire bottom is covered in algae. 10acrewoods- I own and read the book Saltwater Aquariums for Dummies. I plan on expanding my library of Aquarium books, but I haven't run across any other books that seem to have a whole lot of information I don't.