Deb, if a comment is slightly off topic, but still in the realm of the discussion at hand, then its fine. A couple of examples:
A thread is discussing something wrong with a colony of zoanthids. I list out different predator possiblities, which the thread starter has already checked for. You, however, wanted to know more about the predators, so you ask questions about them, which might lead to discussing the heliacus snail, instead of zoanthid fungus or something like that.
Another example may be discussing flow in an SPS tank. During the discussion detritus is mentioned, and how this can be utilized by corals. You post that you thought corals had to be fed. The topic then goes into a coral feeding discussion, while talking about different ways to provide flow.
Do these examples help? We are all here to learn, and if a thread takes an off-shoot based on something that was said in another post, then it really isn't a big deal at all. Take a look at some of the super long old threads in the advanced topic forum. They have a life of their own, and usually talk about many different things. As long as a discussion is taking place, then no big deal.
Also, joking around isn't a big deal either. It's fine to have fun and joke around in threads with our friends, but its also important to remember what we're here for. UGH - I couldn't stand it if our board was stiff and no one had a good time! Read through some old threads, and the more you read, the more you'll see what I'm trying to say.
Basically, don't worry about it. If a thread is going off topic, then its very easy for a Staff member to post "let's get back on topic". Its fine to ask questions on a related topic in a current thread, provided it has to do with the discussion at hand. It wouldn't be good to post about the latest shoe sale in a thread about powerheads....although, I'd like to know about the shoe sale so feel free to send PMs
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Here's an example of how we like to have a good time. I don't know if the jokes will make sense, since this was a while ago, but it was an April Fool's joke:
April 1st Member Showcase