Fish naturally divide into various types of feeders - damselfishes,clown fishes and gobies, for example, are filter feeders, almost automatically passing minute particles of food into their stomachs.angs are grazers; butterfly fishes are pickers; angelfishes both graze handpick; triggers, lion fishes and groupers are predators; and wrasses and goat fishes are scavengers. Some fish are vegetarian - tangs in particular -whereas some are carnivorous, such as lion fishes; most are omnivorous,taking a range of foods.
Fulfilling all the marine fishes' natural dietary demands in the home aquarium is not always easy, especially bearing in mind the need to carefully monitor feeding levels and to ensure that no excess food is ever introduced into the system. Not only is it vital never to leave uneaten food in the water because of pollution, but it is also important not to allow the fish to over-indulge themselves. Ensuring that shyer fish get their fair share of food to meet their dietary requirements, while there are more aggressive fish eating everything available, is quite a skill, and one that every successful marine fish keeper needs to develop.Some fish are nocturnal in their natural habitats, for example, and these may not he so willing to venture out into the brightly lit open areas of the aquarium to take their share of the food available.
