I saw my naturopath today, great doc, he said when you're using Bentonite you can have blood in stools. If it's just a small amount, no big deal (mine was) but if it continues, like anything, just stop the bentonite.
Also, he tested me via Applied Kinesiology, for metal poisoning, as I have six mercury fillings from my youth and recently due to a broken wrist, have titanium in my wrist. I tested showing no metal poisoning. He said having mercury filling doesn't mean you have metal poisoning, that there are other factors. I'm attributing the good testing results to that fact that I've had such a clean diet for so long and have been detoxing my liver.
Well, that's my story anyway, and I'm stickin' to it ; )