Fish Flicking?

[SchottayB]

Not sure if this is an emergency but my Rummy Nose are flicking every now and again I hardly notice it.

I've sat and looked time and time for white spot and they all look fine, water is fine too.

I've not seen any other fish doing it apart from the Rummys?

They playing or what lol?

I sat and watched them and 2 or 3 out of the 14 did it twice in roughly half hour? ... no white spots? They all do it from time to time?

 

[RamboFish]

I may be wrong but my platties in my established tank. My levels are all great and fish are healthy, I've almost come to think its just something they do!
Even my fry do it on a pebble in fry box sometimes!