lol im to cheap to order clay balls, so i use soil in its place never had a problem doing it this way, but i didnt flush the soil from a past grow that im using now, which is theory 1 it still had ferts in it which is causing the problem, theory 2 the well water around here which has a lot of bleach and such in it is causing it but anyhow its only 1 that has the problem real bad the other 2 which have some spots they are fine so far and im tryin everything to fix the problem and i also hooked the dwc up so hopefully that helps a little bit ill change the water again friday when i move everything to the empty room and get shit set up ill update pics and all that then