I have had my Zebra eel for about 5yrs now in my reef tank. Very calm eel and doesnt bother anything. He is about 4ft long and about 3-4inches thick. I pet him all the time. Only comes out at feeding. I feed him once a week about 11-12 mussels. I also have in my tank which is a 125g a yellow, salfin, naso and powder brown tang, clown, coral beauty, 2 damsel, carpenter wrasse, long nose hawk fish, 2 manderins and 2 engineer gobies. Dersa clams and many different corals.