Given your comment about how tngs keep changing, how would a person decide if their post was on an "advanced" topic?
I suppose it is like anything else on a forum..... there is no perfect answer. I think 90% of it would just take care of itself and what wasn't could get moved to a more appropriate place. Honestly, I don't know that it would automatically be "topic" specific as much as it would be depth of discussion. For instance.... someone asking about making a yeast starter.... that is not "advanced" - However, if one is considering the scientific benefits of "Shaken not Stirred" vs. Stir Plate or methods of harvesting, storing, plating, propagating yeast.... it would fall in that area. Or..... "What do think of my water profile?" where someone is just looking for a quick answer might be more likely to head for "General" as opposed to someone who wants to delve into the various impacts of alkalinity and methods for addressing it, merits, etc..... might want a longer discussion on the topic which would fit in an advanced forum.
Also - I think it would self select a little bit. Those really looking for an in depth discussion and analysis on a topic would probably be more likely to post in that sub forum. Those looking for a quick answer as to "how to" might naturally head for the "General" forum with more traffic.
In the end, I think there are sort of 3 types of posts that tend to play out.....
1.) I want an answer - quick, concise, correct - to my question
2.) I want to discuss, analyze and consider many aspects of a topic
3.) I want to argue/debate and be "right."
Ideally, I think it would be awesome to see an advanced forum that really centers around #2....... It is not a place to "argue" about a process as much it is a place to really delve deeply into particular topics. These topics might not necessarily have single right/wrong answers. They might not even have answers.
Low Oxygen could be a good example...... if you want learn about it, discuss it, dig into it - join the discussion. If you think it is not worth doing..... stay out of the discussion and join discussions that peak your interest (and vice versa).
Maybe it is to big of an expectation that people can do that..... but, I think it could be a place to take some of the topics that turn into arguments and take them to a higher level of discussion. Might also be a way for people to simply link and redirect questions in the the more general forums (instead of hashing things out and going on tangents in a person's post).
* I have a question?
* Here is your answer, and, by the way.... there is an interesting discussion here ______________ if you are curious about learning some of the more specific details on this topic.
Like I said, no perfect answers. But, as others have mentioned - the depth of discussion that does happen on here is one of the best things about this forum. Sure, there are some trivial arguments. But, there have also been some of the best discussions and information on here as well.