If they were mine and showing signs of fert burns I'd give them nothing but water for a few days. What often happens during feeding of powdered fertilizer is the bottom of the jug or whatever you water with gets a build-up of ferts that haven't fully disolved. This gets dumped onto the last plant watered with it and can burn the roots. With having only 3 plants they're all especially important! I say nothing but straight, clean and pure water for a few days or until you see a change. But never soak them...just water as usual.