I have what I am guessing is the same starfish, purchased as echinaster sp. Real descriptive huh? It has a linkia body type, but is much smaller, only around 3" tip to tip. I'd guess yours is starving, and trying to spread itself around. A type of last ditch effort at reproduction? I fear for mine also, the only thing I've ever seen it eat was a slimy yellow sponge. And it made quick (for a starfish) work of that. I'm going to try some frozen, high sponge content food like Mega marine angel. Have you ever seen yours eat anything? I'm somewhat disapointed in myself for buying this creature, I didn't know the depth things like this could be researched to. Good luck, I hope others with experience with this animal will chime in.