Tiny white lice or flightless white flies in hydroton!

[greenpassion]

I have all my orchids and a few other plants in S/H, and although they are growing really well, I have found that there are tiny white bugs crawling in the hydroton balls. I have sprayed using Safer Soap at each flushing, (2x's a wk.) but I still see them. These plants are on a heat mat, with a small fan above for air circulation, under LED lights, with a humidifier keeping the level around 65%. I'm not sure these bugs are even harmful, as my orchids and African violets are all doing awsome.....