I have an orange tile star in my 90 reef. He has been here for three months. Last Thursday right befor I left for Mexico, I noticed that all the arms were shightly curled at the ends. I took some quick tests and the salanity, pH, Nitrate, Phosphate, calcium, & alkalinity were all in range. I figured when I got back today, it would be dead. To my suprise, my daughter (who house sat) said it was all over the tank all week as usual. ny ideas what is causing this?