[Safe medication for guppy fry]

@Fish Folk I did a 25% water change on Tuesday—the pH hovered right around 7. The water temperature was 78. Filtration: a sponge filter with an air stone inside of it. It’s a planted tank that only houses fry

[Safe medication for guppy fry]

I had about five guppy fry die overnight, but I don’t know the cause. I moved the remaining fry to a clean, cycled tank. None of the remaining fry appear to be sick, but I’d like to medicate them to avoid further deaths. What meds are safe for fry?