George, TF-5 is mildly acidic.

That said, YES I use a stop bath. After all, with TF4 there is no stopping action to speak of.

However, a rinse after the stop is useful with TF4 or TF5 to extend the life of the fix.

If you use only a water rinse, with no stop, you should use running water and not just a still water rinse. And, a rinse still can allow defects due to continued development.