Clamped Platy

[PrairieSunflower]

Woke up this morning, switched my tanks lights on and fed my fish... and noticed one platy has a clamped tail.

My water stats are right on, my last water change was late yesterday morning for that tank. There are no other symptoms that I can see and no other platies are clamping up.

I have no idea what the problem is. Ideas anyone?

 

[PrairieSunflower]

She looks perfectly normal again.

Maybe that is the platy equivalent to waking on the wrong side of the bed?