Great beginning post Leslie.
A few of my own thoughts about the Introduction before I address the issues that have come up.
Fenner gives a very realistic presentation on why aquarists do what they do. For the right reasons or the wrong reasons. It's nice to hear from a person that knows what he's talking about, been in the business since the get-go, and advocates proper care-taking of marine life. It all boils down to this definition of being a "concientious" aquarium hobbyist. What I got from this intro are:
1) People get into things for the wrong reasons, and continue to make to wrong choices due to unawareness and/or misinformation.
2) Being a concientious hobbyist forces us to address some alarming issues
3) It's best if we work as a community to force change in the unethical practices of this hobby
Now, back to Domboski's point about being allowed to keep any animal if one can properly provide for it. I admire your dedication and ability to provide for any and all the animals you take under your care. However, realistically, not many hobbyist are like you. If it were so, Fenner wouldn't have needed to write this book in the first place. Granted, things have gotten better (I think) since his writing of the book. My only concern is that others look at your example and think they can do the same (I really don't want to get too into this point b/c the debate can go on forever).
I find that as individuals we tend to be brash and make dumb decisions, but placed in an community environment, we don't make those dumb decisions for fear of being frowned on, scolded. So what's my point? Point someone out if they're doing something wrong, inform them, offer alternatives/solutions, and if they persist, tell them off. Seriously, it works. Tough love.
Thanks Veronique and Leslie for bringing up the topic of fish/coral collection. I didn't know too much about the subject...but now I'm learning

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P.S. - I've enjoyed the hobby more since I've join the site. Why? Because part of the joy in keeping a reef tank is being able to share it. Shared experiences, shared information not only help us better the hobby, but also allow us to better enjoy the hobby.