I’ve been feeding it about once a week, to any of my tanks, with shrimp, or sucker mouthed fish… but all fish get excited when I dump a glug of the shaker bottle in…. Every single fish, up to the 8 - 10 inch Tin Foil barbs, gets excited, and tries to take in as much as they can… I started thinking it would be beneficial for my bio film eaters, but now I believe it’s beneficial for all fish…