I was given a mixed plant arrangement, and separated them out into pots. It's been so long since I had house plants I'm going to have to i.d. them, pretty sure the one with pests is an arrowhead plant. The little creature are on the underside of the leaves, haven't seen them in the other plants yet. . I did a google search for common arrowhead plant pests, but couldn't find anything quite like them.
the leaf in the photos (underside) is maybe 3 inches long, so you can tell they are pretty tiny.
Thanks for any info, looking forward to getting into house plants again and enjoying the forum here!