Oh sorry, I meant the plantation soil >.> I heard UVB isn't harmful to them, because it's meant for amphibians to help increase their activity level and appetite. It's over the water portion to prevent drying out the land area. Unfortunately I can't prevent the water from getting to 77 degrees since I can't control the heat in my house. I'm not sure why they wouldn't be happy. They are eating well. Could it maybe be that the water is just too warm for them?