Sea Urchins

Today I brought 4 sea urchins which I picked from the shore and put them in my fish tank hoping that they will help with the cleaning up of the wastes. They are quite nice to watch sliding around on the bed and sometimes the stick themselves the the glass and you can actually see the mouth of the sea urchin as well as FIVE TEETH! I did not know sea urchins had teeth.... the mouth with the teeth are scary. I am learning things with this saltwater fish tank. The marine life is very interesting and distracting to observe. I also noticed that some kind of algae grew all over the tank and therefore, the glass became a little blurry, so I also brought around 100 small snails from the shore and I hope they will wipe the glass clean :D

So far, things are doing good...