How fast is an OBT, I have been thinking about getting one. I found a guy that has one for sale, he says it's the most beautiful OBT he has ever seen, but it's also the most aggressive/defensive he has every seen. I don't really mind the defensiveness, I don't handle my T's. I am just worried about it running out of the tank every time I open the lid, or running at me and biting me every time I fill/clean her water dish.