Chocolate chip starfish falling apart

[4801472577]

Help my cc starfish was behind filter for a few days and then I just found my spider crab on top of it and it looks like her arm is going to break off what can I do to help? Checked parameters everything is normal except nitrates are 20 and it's moving but not wanting to eat even when I put food directly underneath it moves away from it

[4801472577]

Looks kinda like this (not actually mine) http://www.thereeftank.com/forums/f6/dying-starfish-help-157149.html#/topics/157149?page=2&_k=e2649o

[lmm1967]

Salinity could be the issue. I believe stars are very sensitive to high salinity.


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[4801472577]

I checked with my hydro meter salinity is 10.23 but I will re comfirm with refractometer tonight thanks for the input

[Gone Tidepoolin]

Sudden changes in salinity will do that.
How do you top off the evaporated water?
Salt build up falling into the tank?

[4801472577]

With ro fresh water salinity/specific gravity is pretty constant at 1023 I think I found out the culprit I have a spider crab that was attacking it crab is removed and I think the spots are healing and it's finally eating again