I just wana check something im a bit ignorant on

whats the minimum ACC i can get away with?

i dont savage so i guess A8 is my benchmark [assuming ex dungs are equal or lower] and ive found literally 1 source that says 500acc so just want to confirm really.
[because im missing miasmas out the wazoo and want to know the minimum of basic iv melds i need to do to save $$$]