| first of you will not find any scientific data on Garlic use. I have yet to see any scientific testing to prove or disprove its claims. THis also means you will likely not find anything defining whats "too much"
Based on that, follow the instructions on the bottle. you can likely double or triple the dosing without an "overdose" but i would not try it. You also need to take into account total volume of your system.
Garlic is dosed two ways..
1.) add 2 drops per teaspoon of food, this is a self controlling measure.. the larger the tank and fish the more food you use, thus the more garlic is used, but the larger water volume can handle it.
2.) Add 1 drop per 10 gallons to the system. This method is best only used to get finicky eaters to start eating. (adding a few drops like this is also a good way to dray out fish and inverts to show off your tank to visitors)
obviously adding more than 1 drop per 10 gallons would be too much.
i see your point about wanting definitive info, but in this case if you just follow the directions you should not have to worry.
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