If you get them eating, have a large enough tank and no fish to stress them out, you stand a fair chance of keeping them for a while. They will pick at corals. They need frequent feedings and a variety of food to keep them healthy. They need to be with fairly docile fish. Otherwise they will stress and break out with ick.
I love them, totally worth it if you are willing to provide for it's needs. Make sure it's eating pellets, it has a lot of dietary needs, nls are best. provide a varied diet, provide live sponges in the tank for occasional grazing & lastly a peaceful environment. Hopefully, it leads to successful results. IMO, totally worth it if you can be successful.