USDA says fish (and pretty much everything else) is “safe” indefinitely if properly frozen. Taste and texture are what the majority of timelines are about. That and your chances of accidentally messing up the freezing with a power outage or improperly shut door goes up over time.
White light has red in it. Cyan does not. We fatigue blue and green cones everywhere but the white can, and we only stimulate the red cones on the white can. The result is it looks red.
https://youtu.be/bpHX_9fHNqE
Unfortunately brother seems to be doing it now too. Don’t let your old Brother printers update.