comments:
ProfessorKrandal posted on r/aquariums1w
It's called shrimp mineral, by Salty shrimp. Can get it on Amazon. Not to be confused with the fake stuff called salty shrimp. It should come from Germany, not have a big US flag in a heart on the front. If in doubt, read the reviews. Real stuff; https://www.amazon.com/Salty-Shrimp-Mineral-GH-200g/dp/B00HZLUGSI