I think your temperature is a bit cool for them. Try raising it to 78 or 80 and see if that doesn't get them eating. I would also loose the plastic plants in favor of real plants--the frog skin is pretty delicate and could get cut on the sharp egdes. If you have to use fake plants, then try the silk/fabric ones that are not as sharp. Sometimes these frogs just go off feed for a while, and don't eat for a week or more. Then they eat everything in sight. Mine seem to prefer guppies to rosy reds for some reason, and only eat worms once in a while. Make sure you have a cave or hide box for them to wedge under as that makes them feel more comfortable.