I believe HCA can be skipped
Definitely. I never use it.
Fixer, however, is a different matter.
In general, if you don't fix film, it will have a milky white to pale yellow appearance, with the negative image showing kind of weak through it. This is the unfixed and undeveloped silver halide you're looking at. You can see this if you take the film out of the tank right after the stop bath, at which point it's sort of stable. However, if you introduce any reducing agent to it at this point, the unprocessed silver halide may instantly turn into metallic silver. Depending on the chemistry, this can also involve a degree of migration of silver through the film base, resulting in the iridescent appearance that you got on your particular roll of film. Again, my best guess at this point is that sulfer was introduced to the film somewhere after development and before you took it out of the tank, resulting in a high level of fog.
The good news is that your rodinal is likely fine given the fact that it developed an image.
. No dumbass here!





