White Sand Star - Bad or Strang signs

[cwatkins]

I've noticed one arm of my sand sifting star is either disentegrating or being eaten. And another arm looks like it's lost a bit. Could this be a sign of death (lack of food in the sand bed) ?

Some poor quality images attached.

Is there anything I can do?

Parameters were good last time I checked, due for a w/c this weekend. Water is already warming up in a tub.

The only new things are an angle, damsel and a new Rowaphos reactor.

Cheers.