I have an issue. This is my brooder: 66 gourt storage box equipped with 60W bulb and half the top but the temp is still low so I got these: and put it under neath the felt so it wouldn't be disturbed. I put 4 in there since it was small and then i added another light. they are still peeping and huddled together. I'm thinking about changing out the pine and just going with pee pee pad so that if i use a heating pad underneath the cage it will penetrate above the pad since i had one underneath and since i have pine and felt it doesn't penetrate enough to make any difference. Help..