Speaking purely for myself here - if I see a post, I don't normaly know anything about the person who's posted. Especialy if it's someone who's new (though I check how many posts people have before I reply and I try to be gentler with 'newbies'). I have no way of telling how much they know about the fish they are keeping or what their own views are on the subject at hand. If I notice something's wrong with their setup (like having a bala in an undersized tank like you said), I have to tell them. Many times the person already knows - but sometimes they don't. As far as I'm concerned, it's worth inconveniencing a lot of people and forcing them to write a few extra sentences of explanation if it means some people actualy learn something new to their, and their fish' benefit. Now if there are five posts above mine saying the exact same thing, I see no reason to be repetitive - I don't want to inconvenience myself writing a couple of extra sentences