I think the important thing to understand is that in a hobby where there are many "right" ways to do things, such as this one, it is wise not to blindly trust any single source of information. If you post a question on this or any other forum, and you only get one response, are you satisfied? You shouldn't be. The same goes for advice received at a LFS. Yes, there are knowledgeable folks working in stores all over the place, and there are also folks who may not be. I can't remember who it is, but someone on here has in their sig line "read a lot, think for yourself." That's good advice, in my opinion. It can get confusing when you hear conflicting advice, and it can be hard to know which advice to take. In that event, I think the best thing to do is to look for additional sources of information, and arm yourself with enough knowledge to make an informed decision. That information can come from the internet, your LFS, books, fellow reefers whose tanks you have seen, or ideally some combination of all of those.