cichlids are considered tropical you just need to get familiar with the names and temperment of each species, it's easier to identify with a name or a pic to someone who knows cichlids there are alot more than people relize and more diverse in there needs then say livebearers
african mbuna will have a different body shape and although these are herbivourous they are more agresive cichlids
while rams are smaller and much less agrisive
and oscar huge and relatively agrisive omnivors
there are so many types
and ypu can't really say that blue ones are agrisive and not red ones
if you have a specific question everyone will be able to answer it but theres no broad easy rule to determine temperment