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Garlic is typically recommended as an additive for food that increases the appetite and strengthens the immune system of the fish to assist with fighting things such as Cryptocaryon. However, neither of these things have been proven, it is just all based on anecdotal evidence (which is not evidence for anything, other than bias of the human mind). It may or may not be beneficial, there just is not any evidence for it currently. For this reason it would be a bad idea to use it as a sole treatment for a case of Cryptocaryon.
- Garlic: What has been studied versus what has been claimed by Steve Pro - Reefkeeping Magazine
- Garlic versus 'Marine Ich': Diallyl thiosulfinate activity against Cryptocaryon irritans infestations of marine fish by Horge Cortes-Jorge - Reefs.org