FIRST GROW - rockwool debris? or MITES!?!?

Hey guys, these seedlings are sprouting and I'm not sure if these black specs are mites or if its just debris in the rockwool? I didn't really notice them till yesterday when the top of the rockwool was not wet, more moist/dry. I only notice black specs on 2 plants, but around/in the rockwool of most/all.


Thanks alot guys for any info.

They are unmelted peices of rock. They look like black eggs, but alas... are not.
Per hydro sales men