Little Brown/Black worms

Hey guys and gals, first time poster here, I am growing DWC, 5 gallon Home Depot buckets, using SDA530, so 950GPH I believe with 8 sites. GH floraduo 2 part nutes. I have a few problems with thrips now and again, but sticky paper takes care of that pretty easily. I never have seen small black worms, but I just harvested a Jacky White (awesome strain) after I trimmed it up and hung it up, I took out my root mass and from underneath my airstone there was a bunch of black and brown bugs. I drowned them in some water, and it killed them, and I looked at one of them under my microscope and there was a stinger looking thing on its ass, and its head had some tiny horn looking things. Any help would be awesome!