Ok, well last night about 5 minutes after the light went out i webt to my tank to try and find my Harlequin Shrimp and there was a huge(6") worm that i have identifyed as this type of worm. From what i could find it just eats on detrius and stuff on sand bed. The question I have Is: "I havent seen my new addition(harlequin shrimp) in a days or so, he/she is new." I got it saturday afternoon. I bought a chocolate chip starfish last night and put it in the sump to try and coax it outta hiding and nothing. You think the fireworm may have eaten the shrimp? Or just hiding, getting used to the new home?