Marine eels can make an interesting and unique pet in a well secured aquarium with the appropriate habitat mates. Despite having poor eyesight, their incredible sense of smell makes them voracious hunters so they should only be housed with fast-swimming larger fish to reduce the risk of tank mates becoming a meal.
An aquarium for an eel should have a well-fitted, secure lid to prevent escape and be a minimum of 50 gallons, although larger may be required depending on species as some do get over 6 feet in length. An assortment of frozen and freeze-dried marine life such as silversides, krill and shrimp will provide a balanced diet for marine eels which can be hand-fed with the assistance of feeding tongs. Like other marine species, stable water quality is vital for the health of marine eels and water should be routinely tested to ensure appropriate parameters are in place.
Eels should only be housed with fast-swimming, larger fish to reduce the risk of being eaten. Some species are more aggressive than others, and even an eel that is well fed runs a risk of grabbing a tank mate if hungry.