Powdered fern leaves good for carp

https://phys.org/news/2020-12-fern-immunity-growth-carp.html The link above talks about how fern (Adiantum capillus-veneris) leaf powder improves immunity and growth of common carp. I wonder if they'll put it in fish food for goldfish, too. fern_ leaf_powder powder_ greens_ goldfish_