Unknown- looks like starfish???

Ok. SO My tank was in need of some cleaning today. I decided to do some pruning and re-aranging. I also dug down into soem sections of my sand bed to just get it agitated and ewhat not.

Well I am looking at the tank about an hour later and I see this white thing on the glass. I look closer and notice it is moving and it looks like the center section of a starfish. It looks like a starfish that hads all it's legs broken off and had basically a mouth left and a few small leg sections....

I have no freakign idea what it could be. I used to have a large brittle star in my tank but it dissapeared about 2 months ago and I figured it was dead. It was brown and huge. This thing is white and tiny....

Here are some pictures. Hopefully somebody can ID it.