I have a 55 gallon reef and I have a decent bioload. The tank is setup sumpless so filtration is limited to hang ons. I'm looking to add a starfish that will help clean up uneaten foods and wastes. I had a large brittle star for a short time, but it would only eat hermit crabs and never scavange for anything else. I was wondering if the serpent stars are a better choice. I currently have a sand sifting star in there and he is doing very well. I don't want any competition for food either. Is a serpent star the right choice