A few months ago I started some plants from seed (cilantro, small tomato plants, basil, etc). Recently we've had a lot of gnats around and I didn't think much of it. Then my cilantro (which was growing better than all the rest) started to die. At first I thought it was just how I was caring for it, but then noticed lots of small blackish dots all over the leaves. Thought maybe they were eggs, but when you look closely some of them are moving around. I think my cilantro is a lost cause by now, but I have noticed a few of the tomato and basil leaves are yellowing and have the same little bugs on them. What can I do to save my plants? (when I have googled the issue most people suggest how to kill the eggs in the soil, but I don't know how to deal with the ones on the leaves themselves without killing the plants) TIA for any advice!