Plate Coral Moving?

[gravedigger2step]

I have what I believe is a plate coral. Its doing unbelievable and is growing great. I placed it in a big open area in my tank on the sand as the LFS told me that it needed a lot of room so its tentacles could open up. So I did as I was told, and its been there for a solid week. I was looking at my tank tonite and I noticed it moved a solid 3 inches!! Is this normal? What might have caused this. My water parameters are all normal. Ideas? Answers? thanks

 

[Anonymous]

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