Herbs: Do herbs need thinned?, 1 by MrsLidwell

MrsLidwell wrote:
A couple weeks ago, I started some herbs in 4inch pots. I started oregano, 2 sweet basil's, and some cinnamon basil. They have since sprouted (pictures below).

My question is... do they need to be thinned?

I will note, that they have been infested with some kind of pest... though I'm not sure what kind it is. I can give a description of the pest (though probably not a very helpful one), but the type of pest it is, I am not sure of, therefore, am not sure of how to get rid of it. I'm going to try a couple of "home remedy" recipes i've come across by googling to experiment a little (as I'd really rather not use a chemical pesticide on herbs I plan to cook with eventually).

Any help is much appreciated!!