Also I've read some things that say to not use a full amount sometimes of medicine. How would I treat these tiny little guys with it? How long? If they did have anything would it infect the tank/filter??
One week. It doesn't sound like they're ill so I'd half the dose. For a 5 gallon you'd normally use 1/2 teaspoon but I'd use 1/4. Yep. Thats why. And your Corys won't be hurt by it. Melafix can interfere with the labyrinth organ in Bettas so I wouldn't use it on a betta.
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5 gallon Betta Palace, 75 gallon Freshwater (coming soon) Official Presenter of the Darwin Award