dalmation molly acting fishy?

Question
Hi...I have two dalmatian molly's along with several other fish in a 80 gallon tank.  One of my molly's has been moving around in way's I haven't ever seen any fish do.  It almost looks like it's shivering or vibrating...?  Have you ever seen any fish do this, and any idea why it might be doing this?
Thanks,
Cindy

Answer
Hi Cindy,
 Shivering by fish is often a part of courtship, i.e., something that male fish do to attract the attention of females or to display to rival males.  

-- Ron
  rcoleman@cichlidresearch.com
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