That front pair of appendages are quite long. In your original photos they are turned backwards in an antenna-ish way, but your newer photos show them in a position you'd expect for front legs. If they're legs then it looks like this critter has eight legs total, so it's not an insect. Probably something in the Arachnid group, spiders, ticks, mites. They are also lacking the three segmented bodies of insects. I think it's some kind of mite. There are lots of different kinds of mites. Many are not harmful to your plants. Some businesses sell predatory mites for organic growers. The long front legs might be an adaptation for grasping prey. If the clones were purchased then these could be beneficial mites which were introduced to help control pests. I've seen sites which sell them having photos.
Whoa, just googled mite images. Think I'll wash my pillow cases.
I think your critters might be predatory mite in the genus Amblyseius. They are sold for the control of thrips.
https://www.icmag.com/ic/album.php?albumid=28418
I've never uploaded photos here so I'm not sure this will work, so here's a link to the google images search results page where I got the image.
http://www.google.com/images?hl=en&...1&q=Amblyseius&btnG=Search&aq=f&aqi=&aql=&oq=