I looked it up and it may cause an issue with snails. I’ve never tried it with snails. You could just put the snails in a QT for ten days. The white spot shouldn’t impact them and any white spot in the water that transferred over with snails would be gone after ten days (at tropical fish tank temps).
Plants I’ve found can handle a single or double dose. Repeated dosing seems to impact mine. Expensive plants could also be removed to QT just in case. Also for ten days.