My first statement here is potentially the most important i will make in this entire post, and that is, I am someone who has several years of experience maintaining an african cichlid tank, and save for some glass cleaning, and preparation of food for and feeding lemon sharks, sand tiger sharks, cownose rays, and some other sw fish during a short time as a volunteer at a not so local public aquarium, I have no real experience dealing with saltwater fish. that said, take my opinions however you wish, but realize they are my own, and i am not going to tell ANYONE what to do or how to do it, cause i just dont have that right.
okay, disclaimer provided.
i feel like there are good points being made on both sides of this debate. i believe that peter's intention is to provide those new to this hobby some valuable information that they may not find elsewhere, or that they may be able to match up with similar accounts in an effort to sift through all of those that they have seen, and make up their own mind. i think that people who are in situations such as mine(read:newbies)owe it to themselves and to the creatures they intend to keep to research as much as possible and learn the requirements of each creature so that they may be successful. lists such as peter's are, in my opinion, extremely valuable for new folks. does this mean that i read one such list and immediately cross off each animal on it? no. no it does not. what this list provides to me is an idea, and a place to start. i think that reading lists like this, or seeing posts elsewhere about such things as mandarins and the necessity for established tanks and healthy populations of copepods, leads people to think and research before jumping in and buying a fish because it looks cool. i for one would be very upset with myself if i went out and bought a fish and then found out that it wasnt going to eat anything i had to feed it, or could get to feed it. i have been researching reef tanks for the past couple of years, and i will continue to do so for the rest of my life. will a list like either one of peter's ever dictate to me what i can or can not keep? the answer is a resounding no. HOWEVER, lists such as these inspire me to find out more about the creatures that populate them and learn for myself whether or not i would be able to provide the right conditions, or if i want to for that matter

. i say good job, peter, and thank you for your efforts!
i think hankthetank makes a good point by saying that people need to experiment with the as yet impossible in order to make advancements. i dont think, however, that this idea is liscense for people to go out and get whatever they want, and figure it out as they go.
as i said in the beginning, im a newbie, so dismiss me at will, but thats what i was thinkin while reading this thread.
have a good day!