I have a Sea hare. I have had him for about 6 months now in my 120. I only have about 10 snails in my tank and about 30 or so hermits (red and blue leg) They are mostly night time feeders, and he eats everything...alge related. I do give him alge wafferes 3-4 times a week and he seems quite happy and I don't have any alge in my tank. You just have to watch once he has cleaned up your tank you have to supplement his food. He also likes to burrie him self during the day in the sand so a nice 3-4" sand bed would be nice for him
