Hi everyone, Me and my wife bought this home almost two years ago in May. Around February (9 months later) I began feeling dizzy, disoriented, had very shaky muscles, and very fatigued all the time. Ever since then I have been unable to shake these symptoms. Sometimes I have good days, weeks, months, and other times I have bad days, weeks, months. I began wondering if it had anything to do with the house itself. The house is in a heavy Bentonite area that has a engineered wood flooring in the basement that hangs from the foundation, and that all rests on two cassons. In the crawl space beneath that wood basement floor I found this: http://img829.imageshack.us/img829/6645/imag0164ns.jpg I would say 50% of the rocks in the crawl space look like that. Some is white, and fluffy looking and reflects when I shine the flashlight on it, and there is that other white cake-looking substance. I should note the previous owners said they had a small moisture problem in the basement that they corrected by adding a fan to one of the ventilation tubes that go into the crawl space. We have been in the house 2 years now and I have diligently checked the sump pumps and that crawl space and it has indeed been dry as a bone. So my question is - Is that stuff mold? Being that it is in the crawl space under the house is it possible that it could be affecting my health? Should I do something to kill it/eliminate it? Thank you!