Hi everyone, I'm getting dark spots on my negatives. From looking at others who've had this problem, I'm thinking it's water spots?

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(photo taken through grain focuser)

My process is as follows:
Film: FP4+
Presoak: tap water - 3:00
Developer: Pyrocat HD 1:1:100 (mixed with tap water)
Stop: water stop - 1:00 (tap)
Fix: Kodak Rapid Fixer - 5:00
Wash: Running water - 20:00
Wetting Agent: Photo Flo mixed with distilled water
Drying: Hang dry diagonally to drip from one corner

Any input is greatly appreciated, thanks!