A linckia is not suitable for many, many tanks and requires a lot of LR as it can not be spot fed. I don't want people to think it is a suitable alternative to a chocolate chip star. Many, many orange (or any other) Linckia die of acclimation shock, and many of the rest of starvation within a year (if there is not enough LR). The year mark is critical. The tank must be mature (6 months old) and pristine water quality for best success, but not all tanks are really suitable to house one.
A chocolate chip star is not reef safe, but can be spot fed with meaty foods (which I strongly suggest doing). Acclimation is also important with them. What do you mean it keeps falling on its back? This is a potential concern.
But all in all, seastars don't "do much." I am not sure what you are expecting?