> avoids the worry of toxic metals.

And, more importantly, of overfishing. When I looked into supplements a year ago l, the algae capsules named "Opti3" had the highest EPA & DHA / Cost ratio and are fully vegan.

Yup, go straight to the source (where fish get theirs)

The fish or marine invertebrates synthesize EPA and DHA by consuming microalgae that {1}do not contain both.

{1} https://www.ncbi.nlm.nih.gov/pubmed/24152561

You can also get omega-3s from grass fed beef and pastured eggs. 3 quality eggs in the morning and I get 210mg+ DHA. The more people knew this the more demand there would be for local meat and away from factory slaughterhouses, especially now that the pandemia exposes their vulnerability. We've got workers risking disease to bring us low quality, nutrient sparse meat.

Sardines and anchovies eat mostly plankton so there is no toxic metals there.