I've been reefing on and off (i'm a college boy, its hard to do both) for almost 7 years now. I've also worked for 4 LFS in that time, 2 good ones, petco (nuff said) and a bad one. I think think the main diff between a newbie and an "oldie" would be BOTH knowledge and how well one communicates this knowledge. Working at LFS's I've seen many stages of what i call "newbie'ism."
The first is, "those are purdy, let me get one of dem fo my fish tank (freshwater of course).
The second stage they've accepted that they need a salt tank, and will listen to the bare minimum that the LFS employee tells them, but won't listen to stocking issues and won't buy a book (waste of money
).
Third stage is they start reading books and maybe get online, are having decent luck with their tanks, maybe have replaced that seaclone or skilter and now start stocking their tank with corals and anemones (against everyone's advice, assuming they have a good LFS).
The final stage I think in Newbie'ism is the "know it all" syndrom. This usually comes anywhere from 8 months to 2 years after starting. It is the attitude that they know it all and will dispense this info to anyone that will listen. I've seen it working at petstores, going to petstores and on BB's. I went through this nasty stage and even went so far as to tell Eric Bornemon off, saying he didn't know squat as i was ignorant as to who he was, even though his book was sitting on my bookshelf, read at least 5 times over (i wrote one heck of an appology afterward).
I still consider my self an immature prick and i do still on occasion blow up at someone online. I try not to and give constructive answers, but sometimes its so hard not to (i.e. tang in a 20gallon). I do find it fun though to go into LFS and note that I own have have read every book on their shelves multiple times, and then treated like I know squat by an employee who prolly has been reefing much less then I.
Anyway, I'm still learning and love BB's as it allows one to see personal experiences.
Buba