What's happening to my Acan?

[Chiefmaster30]

Apparently this asterinia starfish is eating on it but it's been dieing for some reason before that! Al l parameters are stable. 120 gallon tank with 30 gallon sump.
Sal- 1.025
Alk-9.5
Cal-450
Mag-1350
Nitrates2.5
Phos-0.03
Only issue I'm having is cyano issues!

 

[Fishfinder]

Do you have any peppermint shrimp?

 

[Chiefmaster30]

1

 

[DSC reef]

The asterina is most likely eating the algae. Battling cyano means there's nutrients. Numbers look good but are there any big swings? Any other coral issues?

 

[Texas Reefer]

That asterina may just be eating the algae growing on it.

 

[Chiefmaster30]

No other coral issues!

 

[Fishfinder]

If you have a peppermint I'd watch him closely, remove him if the acan gets worse