Are sponges full of bacteria?

Sea sponges are the tropical forest of the oceans looking at the amount of organisms that are discovered to be useful in medicine. Sponges are present at the soil of the sea and are there for quite some time now. Only a few animal species are able to digest sponges. This is because of a range of toxins the sponges produce to keep them safe from harm. It is discovered that some of those toxins can be used in medicine against cancer and other diseases. Actually, the sponges are not the ones making the toxins...