..until I read an article about it somewhere. You're probably right, though, as far as the toxicity is concerned. It seemed like I read that in Cozumel they were pushing (or perhaps now requiring) using sun block that breaks down quicker and were considering (or already have) setting limits on the SPF rating that you can use in the water in the marine parks. I have been diving off of Palancar and have seen slicks of sunscreen coming off other divers as they enter the water. You can imagine all the divers that get into that water in one day. I could see sunscreen adding up like that, although, like you, it never occured to me until I read the article about it. It's been awhile since I read it so I'm a little rusty on the details, but I'll see if I can track down the article or where ever I read it and see if I can't post it or at least cite it here on the board. It was most likely from one of my dive mags like Rodales or Alert Diver, but it may have come from a news article I found online.
Again, I know it's off topic but I just thought I would throw it out there... a little food for thought.