The most common Eel for your Marine Aquarium is the Snowflake Eel. They can grow up to 60cm in your home aquarium. But a little bigger in the wild. They tend hide most of the time with just their head sticking out. Waiting for dinner time! They are nocturnal predators and do tend to do most of their getting around at night. They will happily take frozen food mostly meaty foods and shrimp. Just be careful they have a very nasty bite!