Overfed tourists of course are partly responsible for water pollution (and sight pollution) but I took that picture on a small outer Island, I think it was Lanai where like 8 people live. If you dive in many places in the world including Tahiti which is rather remote you will see hoards of tangs, slugs, urchins, chitins, rabbitfish, algae bleenies and manatees. Those animals eat algae and not much of anything else and they have been there for thousands of years, long before overfed tourists. The algae is there and it has always been there, tourists or not. Algae is a normal, natural and healthy part of any tropical sea and if you don't see any algae it is because those animals I mentioned ate it all. But if you remove those animals for a week, the sea would be a soup of algae. Nutrients or not algae grows. These guys eat nothing but algae so if you throw one or two in your tank, your problems will be over. In more ways than one. We should think of algae as a friend instead of an enemy. 






