Guys, thanks for all replies. I though all the same thoughts that you had. First time it happened I thought it was my mistake. And I do make some mistakes here and there. But, once again, I developed same kind of film - FP4+ 125 - in the same tank. Both rolls were used in the same ocasion. Same water, same temperature control, same developer, same everything. But, one came as clean as it could be and the other came with all the marks. The same thing happened some month ago, with the PAN F+. Would you think that it could be any kind of fungus?
Really donīt know whats is going on. But, if it was a mistake, same problem should happen to both rolls in the tank, donīt you agree?