What r these black(ish) dots on branches?! PLEASE HELP!!

The ladies are about 7 weeks old. There IS a gnat problem that we are taking care of but I don't know if this is related. There are small (guessing less than 1mm) dark dots on the branches.There are dozens on each tiny 2 inch branch. :( It started on the lower ones & is working it's way up. I have looked as closely as I can (only have a x6 magnifying glass) but I never see them move & don't THINK they are bugs...no webs or anything. Some of them look as though they are actually IN the branches...under the layers of "skin". These are indoor & under florescent until tomorrow. They look pretty good...a few curled leaves & what looks like a nut issue on 1 or 2. I've also seen things that jump like fleas & are about 1 to 2 mm,oval, gray, & have long antennas. I'm not sure if they are even "bad bugs" & have only seen a few since we sprayed a few weeks ago. I'm not even sure if this is normal or not...I've never noticed it before or seen any on close up pic's I've looked at. I know pic's would help...but don't have any. If there are ANY suggestions to help me figure it out I'd appreciate it TONS!!! Thanks for the help.