Ive started to see round spots appearing on freshly developed negatives. Initially, I thought it was poor agitation or even air bubbles but I have just developed another test negative and they have appeared again. This time I let the mixed developer stand for some time before adding it to the tank, I also rapped the paterson tank fairly hard on the counter top on its edge to release any bubbles after each 1 minute agitation and also at the beginning. I accurately measured out 2ml of Photoflo instead of guessing the amount but they still appeared. Any thoughts ? I have just developed another test negative, only this time I have replaced the Stop Bath with water, this negative is still drying.