Do you mean "melting" as though he's falling apart, in a way? When I had a saltwater tank at school for a senior biology year-long project, we had 3 orange linkias and they all died throughout the course of the year. (They were originally our teachers--she was recarpeting her living room and had to take down her tank, so we set up a saltwater one in her classroom so she could have someplace for her fish. She was surprised the stars made it for as long as they did, because they were very very old.)
When the linkias were dying, they would get lethargic and their arms would start to sort of disintegrate. At our teacher's direction, we'd leave the dead/dying star in the tank for one school day as food for the tank scavengers, then take it out and dispose of it.
When my chocolate chip died (after the damn thing ate all my mushrooms...) his arms started falling apart and he could barely cling to the glass, so I took him out and he like fell all apart in the net. I flushed him.
Also, from what I hear linkias are difficult to keep, so kudos to you for however long it lived.
