I should start by saying I don't know what your moss is, but it a "pleurocarpous" moss, which means that it isn't a Barbula or Micromitrium species (these are "acrocarpous"). I don't know what the moss labelled as Micromitrium or "Millimetre moss" is on Polish forums, but I don't think that is a Micromitrium either.The top one i have identified as our aquarium 'millimeter moss'
I've got, what I think is, this one as well.Amblystegium serpens