tiny round white bugs in reservoir

So i have these little white dots on the top of the res. nuitrients. They look like a dot a white ball points pen would leave pressing strait down. They group together in some place maybe 50 so in a spot andjump a inch or 2. I got the feeling the spring tails , like all I read before they dont do harm but what would bring them When the plants are in 6 weeks flowering on a 10 week strain and are super healthy mabye a occasional messed up leave here or there but look amazing , what gives? They only appeared at most 2 weeks.

pics of bugs and buds

did you ever figure out what they were? what did you do about them?

kill them...they have to eat something, and it probably isn't rez water

Yeah they never did anything to that grow, i did nothing they all dissapeared on their own and never came back. Since then ive done a few grows no isues ever agian. I think they were eating roots or root related stuff but like i saidmaybe a month after i saw them they all dissappered on tjeir own.

root aphids...