How long have you had them. My frogs are in my office which has a computer monitor which is the light that I use to view them with. When I first got them they would be shy when I turned on the monitor. I feed them shortly after I turn on the monitor and now they don't care about the minimal light or me sitting there watching them. LED lights are not that bright and should work. I use a heat mat on the side of my tank because I have my house AC set at 72 degrees and I don't want them to get cold. Its on a thermostat so with the lights on in the tank during the day it doesn't go on that much. At night I have the thermostat set a little cooler than the day temp.