I guess those negs are dry now, how do they look???
Hypo-clearing agent followed by a good 20 minute wash helps a whole heap too.
Also I remember reading somewhere that the pH of the water used to make up one's fix has an effect of the colour/tint of the negs. Remember this going to be printed or scanned as black & white and not as colour, so a slight tint is fine. However saying that, a strong purple colouring requires more fixing and darn good wash. Purple colouring with a cloudly/milky look in the shadow ares (clear parts of the negative) is BAD... maybe terminal.
P.S. I've just installed one of those energy saving light bulbs in my room and everything white seems to have purplish tint right now. I foresee my monitor being recalibrated again soon...