For Tomato frogs you want humidity around 80% and temps between 70-80F. That can drop to 65-75F at night. If babies they like it colder so I would not go over 75F with them. Like Pacman's they are nocturnal and also wait for prey to walk by.

As Colleen/Jerrod stated, you need to supplement their food. Gut load crickets with veggies and Repashy's Bug Burger. Get night crawlers at Walmart (can cut from pointy end if frogs are small) and dust with CA 2x and vitamins 1X weekly on different days with skip day in between (Repashy and RepCal are good supplements).

You can use a small fluorescent to observe them as long as it does not heat the tank up; these frogs really like it on the colder side. Have read that low watt UVB compact fluorescents help their red coloring, but have no proof of that. Good luck !