Expanded polystyrene chips are good. The usual precautions must be made to prevent ingestion whilst. Breeding is usually quite easy with these species, although the smaller species has been known to get aggressive at breeding time and can get a taste for human blood. Sometimes it is even possible to club together with other serious keepers to rent artificial ski-slopes and the like. Feeding is sometimes quite difficult.
Fish fingers are a favorite but are rather small fare for the larger species.
You can also offer penguins but it's best to pre-kill them and add a small amount of sodium chloride. The beaks can cause a lot of damage if is the bird is not constricted properly. Pinky polar bears and pinky seals are a good first food for the hatchlings of the larger species and often it is as well to stick to this diet. Although the snakes love shark, these should only be offered when all else fails. There is one problem with these snakes, and that is that they are very prone to getting arc-tics.