Are any of the other plants wilting? Try Easy Green as a first course of action.
How big is the tank? Maybe also try dimming the light a bit, or turning it on less?
Does anyone else have any other ideas?
@Fish Folk @Guppysnail @Chick-In-Of-TheSea
I've seen bumblebee cat fry before (in one of my Gdads aquariums) and they look very cute!
They should breed quite well in the same tank as the Pseudomugil Gertrudae (I prefer Luminatus, but hey-ho!) as they spawn in different areas of the tank.
Welcome to the forum! I agree with @Scapexghost, once you've added water its safe to add plants, as they'll help cycle the tank etc and get it ready for fish.