Hey I need to see what is going on. I have a red serpent sea star that the end of his arm is starting to turn white. Has anyone ever see this. When I get him to come out I will try and get a picture.
This may be the worst advice, but what I would do is cut it off about 1/2 inch past the dying part. If it is a disease of some kind then it might just stop it from continuing. It's leg will grow back.
No I did not expose the sea star to the air when moving. I acclimatedover about 4 hours. He still moves around good like there is nothing wrong. It seems that he is regaining some of the color slowly. Will keep updated.