It's a chocolate chip star fish and has been completely fine untill tonight. What does it mean?What does it mean when a star fish has swollen tips?Check your salinity and make sure the water isn't too fresh.
Also, he might just be reaching out hunting for food. If the salinity it OK, feed him some silversides, krill, or other food.
Starfish might also curly back their tips when water quality is causing them stress. Check your water levels, even temperature, and make sure all are at acceptable levels. Do a partial water change to correct any issues.
The last thing I can think of is some sort of chemical added to the tank. Have you medicated or added anything before the behavior? If so, stop adding it, and do a water change to reduce the levels of the additive.
And just to confirm, are you sure he is not just eating? Often they will stop and eat, and their center will expand as they eat. They eat by centering over their food and inverting their stomach to digest it. Once they are done, their center will return to normal and it might make the tips appear to have gained in size.
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