From what I understand blue linkia stars can be difficult to acclimate. I would stick to the serpent star for now as they are very hardy. I would say that serpent stars are more of a opportunistic scavenger than a carnivore. Yes they will eat meaty foods but it is unlikely that it will hunt down and prey on healthy tank mates. I just recently acquired a serpent star from FloridaPets. I posted a thread about it last week with a photo of the star. This is also usually a common item at local stores. Usually they will hide underneath a rock with only an arm or two sticking out and can be difficult to notice if you are not looking for them.
A newer pic of my blushing finger leather. Looks like it filled out a little in the last two weeks. I also suspect it is starting to align itself to a more vertical position for lighting since my placement kinda had it on it's side.
It appears to be doing much better, although the polyps do not yet look fully extended. Blast it with flow and try dosing some iodide and it should grow very quick.
I did my usual feeding this morning and gave the fish a typical treat of bloodworms. Since I was feeding with a turkey baster I decided to feed one to my single button polyp. I got the idea after seeing photos of a sun coral eating mysis shrimp. Up until this point I had tried spraying it with the other chopped foods like clam but it never would seem to eat. It appeared to REALLY love the bloodworm. Sucked it down like a spaghetti noodle. Maybe this will help speed up the reproduction so I can get some more. My poor button needs friends...er clones.
Wow. That is a very inpressive photo. How long have you been feeding bloodworms to your fish? I used to feed frozen bloodworms to my cichlids but never thought about feeding it to some polyps before. Very nice!