I would use stop bath with both film and paper, RC or FB, 15 seconds is fine for both, but 30 safer, water does not stop the developer action instantly, and you can get some carryover of developer into the fixer, which can shorten the life of the fixer, If you do want to use water for film, the best way I have found is water, invert tank for 10 inversions, repeat twice more
Richard
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