Yours is the exception to the rule. The slow die off of the majority of Linckias indicates a nutritional issue, starvation. Even a properly collected and healthy individual will starve in tanks not long established or not large enough to meet their dietary needs. There are no hard based facts regarding what specifically they do eat and what you can give them as a substitute. Even Liveaquaria list them as difficult.
Saltwater Aquarium Starfish for Marine Reef Aquariums: Linckia Sea Star, Blue
+1
I highly suggest anyone that has or would like to have a linckia also read Bob Fenners comments and concerns on WetWebMedia. Sorry if I'm breaking any rules for post WWM.
