No...Rafal ...I didn't tap the tank...I now know I it's good practice even if it's not the cause of the spots that turned up on this set of negatives. Yes, Andrew...I think that's what happened....the label is awful...but now that I've read their spec sheet (which is much more detailed) I know it's six minutes. Actually I should have been suspicious given that my color kit is 6min or so but I thought I had remembered a short time last time...obviously I was wrong.