Late to the party - @Kryptonian is correct regarding "reef safe" medications. These herbal tonics will not cure acute protozoan infections. I understand the photo that you posted was just representative, but folks need to understand the geometric progression of ich parasites: 2 ich, then 50 offspring = 100, then 500, 2500 and then 125,000. At some point around 100 to 500 trophonts on the fish, the disease is replicating so fast that herbal tonics have no chance, indeed even copper may not stop fish loss. Ich management works best when there are less than 20 total trophonts on a fish.
Jay
Jay