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Unfortunately, I am not aware of any way to save these guys when it gets to this point. I would try to keep it away from anything that could possibly pick at it.
I'm not sure what you can do, as I'm not familiar with their care, I do know starfish are a lot harder to keep than people think, it's why I don't have one in my current tank yet
Oh boy, ok for now I'll keep an eye on him and see if I can get maybe an acclimation box to isolate him. Right now he's still moving around and doesn't seem to be getting worse. I'll keep peeps posted
I had a red linka for the better part of 18 months*. About 6 months ago two of it's 'arms' began to recede a bit, much like the arm on the bottom left of yours. Though well fed with various foods, and apparently eating, it appeared to be slowly starving. 4 months back it crawled into the rockwork and I haven't seen it since. A lot of reading seemed to indicate that 18 months was a long run for a starfish in an aquarium, as many won't survive beyond 6 months. There are also many that report regardless of feeding routine in captivity starfish will eventually starve, though I could never uncover a reason why, though it seems to be a consensus amongst many on the net (and the net never provides misinformation).
Best of luck with it, maybe isolation and a variety of fresh foods will help. Along with the norm I used to give mine a bit of seaweed or raw salmon (or any other fish) whenever we cooked any and it seemed to take them readily.
*Its pic is on the photo of the month, from last September, so I've been winning photo of the month for 10 months now, thats not a hint to the mods
@art13 has already said it, the poor guy is starving. I also agree that they are harder to keep than people think. I'd pick up a clam and freeze it and then shave off thin pieces and try feeding that.
OK cool, thank you all who responded. I don't have a clam but I do have mysis so I'll try that. I also have some dulse (sea veggie <--kelp) which I'll try to feed him as well
Crossing my fingers (I don't take the loss of an animal well)
linkia are notoriously difficult to maintain in a reef aquarium. Unfortunately i'd look for an owner of Harlequin shrimp and donate yours to feed them. once the legs start to go like that, I've never seen one recover.
I released him back into the tank, he seems to have fully recovered
no clams, he ignored the mysis, I think he ate algae strips but not sure. He was on the walls of the breeders box which had algae all over it. For now I am going to watch him and monitor