In tank #4 there are 4 eels, they are American eels. They are pretty big, they are like a grayish brown on top and a whiteish tan on the bottom. The eels eat squid identical, they eat about 9-11 tentacles. My job for the eel tank is to first feed him, they usually eat it very quick and sometimes fight over it. Then second I clean the inside with the algae brush. Next, I clean the outside with a rag and vinegar spray bottle. Lastly, I clean the salt off from the top and then I’m done. The eels are very easy to maintain and are easy to feed.