As far as I know, these bright red stars are all in the genus
Fromia. While beautiful and widely available for sale, these animals tend to be very difficult to keep in an aquarium long term. They are specialized sand-sifting feeders that require a very large and very mature sand bed or they typically just fade away and die in most people's tanks.
Here's a link that might have some more info:
I have always found starfish to be pretty cool looking. However, it appears that the general consensus with most species is that they are more troublesome than they are worth. I understand that the brittle starfishes are generally the best species to keep, but they honestly do not appeal to...
www.reef2reef.com