Tiny Bugs on surface of water?

[MiracleDro]

So i have these little tiny bugs that are on the top of the water in my hydro buckets. They seem to be multiplying. What are they and how do I kill them.
They are little white and some black nat looking things that dont fly they just hop around on the surface. They are very very small

 

[smokingjoe]

Any chance of a photo?

Could be anything.