It's seemingly dose dependent. Low omega 3 can seems to have the same mechanistic effect. As for what the dose should be? No clue, personally, and it depends on your heavily diet since even one fishy meal could provide as much as most supplements do. Personally, I don't eat much fish, so I'm comfortable with a supplement. If I ate even one piece of salmon in a day I'd skip the supplement that day.

If I had afib I'd talk to a doctor about it before taking it and probably would stay well under 1G on any day I don't eat fish and skip it entirely on a day that I do.

Not a dr, not a health professional, not anyone you should listen to perhaps at all, but this is my understanding.