Feeding, and the Red/orange Fromia sea star is gone

Feeding:

• 5 drops of LiquidLife's MarinePlankton (made with cyclop-eeze)
• 1 tsp of DT'S LIVE Marine Phytoplankton
• 1 "feeder fish" by California All Natural Pet Foods

The Red/orange Fromia (milleporella?) sea star is gone. It hasn't been seen in a couple weeks and the last time it was captured in a photo was 12/2/05. No remnents and no explanations.