"skozzy" wrote in message . ..
white fly like things doing circles ,and flying
above the surface of the tank [...]

Sounds like water flees to me.

Water flees? What do you mean by this name?
The only animal called with this name is Daphnia, and
it does not fly above the surface - it is crustacean :-)
What animals exactly do you have in mind, Skozzy?