I have had good results using a hardening fixer with Efke film. Fixer with hardener seems to have fallen out of favor, but I find it almost a necessity with the Efke emulsions. I usually process it 6 sheets at a time in a Jobo tank (but do it manually like smaller format roll film) and use PMK (no aftersoak) and Kodak Fixer with hardener and have never had a problem with scratches (knock on wood)