Chocolate chip starfish curled up

[Stacyvamp]

My chocolate chip starfish is laying at the bottom for a few days acting weird. Most of the time his feet are curled up, but sometimes he relaxes for a bit. I target feed him so probably it's not that he is starving. He won't stick to the glass. My salinity is around 1.019 which i know is low but i only found out a week ago and I'm gradually increasing it every day. Is there anything you can think of that is causing this? Maybe other fish?

 

[Colin_T]

check the water quality for ammonia, nitrite, nitrate and pH.

do a big water change. If you are using artificial marine salts, make the salt water up 24 hours before using it. Aerate it during this 24 hour period so the salt is completely dissolved.