Well I can't find any hydroton clay balls. I've went everywhere. I can order them onlien but I was wondering if there is something else I can use other then the clay balls?
Have you tried any hydroponic stores? I've only had luck finding them in stores that specialize in hydroponic gardening (growing plants without soil), which are not super common but even small cities seem to have at least one.
And if that fails try calling your local plant nurseries. If they don't have them in store they might be willing to order a bag for you.