I agree, although its funny how sometimes things just work for newbie's who haven't got a clue what they're going. I had sevrums, firemouths, kribs, electric yellows and angels in a 4' "community" tank many years ago, along with congo tetras, fire eel, clown loaches and a massive redspot plec. I should try find a photo, but then I'd also need to find a scanner...
The best thing to do is read. Books, the internet, anything. Look at what other people are keeping together, find out what generally works, and what doesn't, and take everything with a grain of salt. All fish [especially cichlids] have different personalities, what will work for one person won't for another.