I have one small red starfish, I don't know what kind, about 1", that I have recently introduced to my tank (3 weeks) I also have a pistol shrimp. The last week or so, once the lights go out, I hear quite a bit more snapping from the shrimp than usual, especially when the starfish has wandered into "his" territory. The last couple of days, the star is missing tips of his arms, and these areas are looking "melty"
. Have I made a compatibility mistake putting them together? my lfs
said it was okay. What should I do? Could it die soon?