The pretty, colorful, small species of the genus Geosesarma, including the popular Vampire Crab (Geosesarma dennerle) or the Red Vampire Crab (Geosesarma hagen), also known as Red Devil Crab or Red Devil, are predominantly carnivorous. They feed mainly on insects and small invertebrates in the water, also the one or other snail is gladly cracked. The exception here are Geosesarma krathing and Geosesarma notophorum, both of which are omnivorous and therefore require a larger proportion of plant food than the other species of the genus Geosesarma. The interesting small microcrab (Limnopilos nayanetri) is also a carnivore, as is the panther crab (Parathelphusa pantherina). "Carnivore" does not mean, however, that they should eat meat from warm-blooded vertebrates such as beef. They cannot fully digest these proteins, and they then quickly lead to molting problems and death of the animals. Carnivorous crabs also do not find cows and pigs in and around their home waters in nature, but eat fish, insects, worms, snails, small crustaceans such as isopods and so on. The crab food is specially designed to meet the needs of these crabs. With a live food for example with springtails or white isopods you can still give them a well suited permanent food in the aquarium. These little animals will then also take care of uneaten food remains. Brown foliage such as almond leaves should never be missing in an aquarium with carnivorous crabs.
The omnivores among the crabs live about half on decomposing foliage that collects at the bottom of the water and other plant parts and fruits and animal food. The odd insect that falls into the water is readily taken, and insect larvae and small snails are also part of their basic diet. Garnelio's natural food, especially dried leaves such as hazelnut, blackberry or birch, is recommended for these crabs, as well as AT's food specially adapted to the needs of the genus Uca (fiddler crabs), Sulawesi crabs or Sesarmidae. Other omnivorous crabs can also be optimally fed with these foods. In the water section, other foliage such as sea almond leaves should also not be missing. With these foods from nature and natural products, your crabs will benefit from the antibacterial properties, as well as the health promotion and disease prophylaxis properties. In addition, foliage and other natural products provide optimal, very natural looking hiding places. Live food such as white isopods or springtails are also a good addition for them, which at the same time acts as health police on the land part of the aquaterrarium and takes care of food remains.