After the Horge Cortes-Jorge Jr. article, Garlic versus 'Marine Ich': Diallyl thiosulfinate activity against Cryptocaryon irritans infestations of marine fish of 2000, from 2005 to 2008 inclusive I conducted some additional garlic juice tests. Fresh garlic juice might prove to be more useful.
I used a 6-sectioned 70 gallon tank, using only the middle 4 sections. One fish in each section. All fishes of one species of Damsel. Garlic juice was of two brands off the LFS shelf except when I made my own. Juice was added to homemade food the fish were exclusively fed. Commercially prepared foods were soaked in it. All fish were healthy at first. Microscopically they seemed to be disease/parasite free and without health issues. They were then infected with Marine Ich and the experiment began when they all displayed. A ‘set’ is with each of the 4 sections contains one-fish each, test running/stopping in 3 months.
2 sets (8) fish were tested, feeding garlic to half the fish at each feeding. 2 fish lived past 3 months; one on garlic, one not on garlic.
2 sets (8) fish were tested, all fish were fed garlic. 1 fish lived past 3 months.
1 set (4) fish were not fed any garlic. 1 fish lived past 3 months
2 sets (8) fish were tested, feeding fresh garlic juice to half the fish at each feeding. 1 fish lived past 3 months.
1 set (4) fish were tested, fresh garlic juice added to water at 1 teaspoon per 5 gallons. No fish lived past 3 months.
Living fishes were microscopically tested and found to be infected with the Marine Ich parasite.
1 set (4) fish were tested, no garlic juice. Given treatment with Cupramine. all 4 fish were alive at the 3 month mark. All fish tested microscopically to be free of the Marine Ich parasite.
I cannot detect any improvement or advantage to using fresh garlic juice to help marine fish fend off Marine Ich.