Of this group, the undulated trigger is probably the hardiest, with the clown trigger being a close second. Large triggers like to redecorate, and can often be seen grabbing a large piece of coral and moving it across the tank. Last on the list are the serranids or groupers. Some species, such as the basslets, are compatible with most of the species already listed. The true groupers, however, which are hardier, grow quite large and are best kept with triggers, lionfish and moray eels.
Groupers are carnivorous and have mouths that are very large in proportion to their size.
Thus, they are capable of swallowing fish that ordinarily would seem too large to be a meal. The purpose of this list is to give the beginner and even the more experienced hobbyist a better chance of successfully choosing fish for a saltwater tank. This is a list of personal favorites. Your dealer will also be able to provide other recommendations for fish that are colorful, hardy and likely to do well in your aquarium. Of course, there are literally hundreds of marine aquarium fish that can be kept.