Established 65 gallon tank - up and running for 5 years now. Nothing new has been added in over 2 years but within the last month I have lost (disappeared) a sand sifting star and just yesterday a mystery wrasse. Both have been in the tank for 3+ years. About a month ago the sand sifting star dissapeared, I just thought maybe it got under a rock and died (i did search every part of the tank i could without moving the permanent rocks and could not find it). Today i came home to feed the fish and now my mystery wrasse is gone. No dead body anywhere and it was almost 4 inches long. Is it possible i have something in my live rock that killed both star and wrasse? I plan on doing a water change tonight and am going to move some rocks to see if the wrasse body is anywhere but i dont expect to find it. I have a closed top with NO gaps for the wrasse or star to climb out of. Thoughts? Thanks!