Aphids

Aphids

I have an infestation on aphids on my variety of lettuce plants. When I first spotted them I got out the water and biodegradable dish soap and sprayed all the plants that seemed affected. I kept doing this everyday and they are pretty much gone until I turned a leaf over of one of the varieties and it was covered in them. As I turned it over I felt something prickly on my finger as if they had bit me! Is this possible? These guys seemed pretty green almost brown in color. The plant is not doing so well and they seem to be in the soil also. I am going to most natural route to get rid of them. I want to plant some flowers that will attract ladybugs but I live in an apartment and garden on a very small balcony. Any suggestions? Do these critters bite? Is it something else? They seem to be spreading to some of my other plants! Also any good recommendations about how to prune lettuce and the best way to take care of it? Thanks I am a newbie to gardening and like to learn as I go, but i am stuck! Thanks
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