6 day is very impressive, congrats!
What do you mean that the tongue becomes rosy and white? you mean by stripes or how? because it is completely normal to have a white tongue during the fast (it always happens to me), it is because of plague increase.
The russians say that the the body tells to stop only if you get really really hungry (as normally during dry fast there is no hunger at all) and If you can barely move. But that normally happens after they 20 or so.
This is the content newbie dry fasters need to see! Listening to your body is the MOST important part of any fast. 6 days is impressive and proves just how incredible the human body is. Glad you are taking such great care of yourself!