There are two basic groups of triggers. First has upturned mouth for hunting plankton (water column dwellers), the second has a down-turned mouth designed to hunt the benthic zone. For whatever reason, the first group is generally more docile; they are also less likely to go beserk (see below) after time and less likely to munch inverts or smaller fish... no guarantees of course. The second group includes the well known beserkers like clown triggers; they're more likely to terrorize a tank. Strictly speaking, all trigs are coral safe as far as I've seen, but the big guys might knock over coral if it isn't secured properly. examples of the first group include bluethroats, crosshatch, nigers, pinktails, etc. examples of the second group include picasso, clown, undulated etc.
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