Since the OP asked for both the Pro's and Con's, I think he should be able to hear both. Like I said, I have not collected NSW myself but I am fairly educated on the ecological side of things, including contaminants, that were not a concern "back in the day", or decades ago. The simple fact of the matter is that the state of our oceans is very different than it was 20-30 years ago. Regarding the article cited above, I am not sure when that was written but the reference to the " one or two clownfish that someone bought that were spawned in artificial sea water " makes me wonder just how old it is. I also don't agree with the idea that if the fish are healthy swimming in the water in the ocean then they should be fine in it at home. A fish swimming on the open reef is a very different situation than when they are .......o.