Yeah, it is @ 88*...it doesn't go lower than 84*, which is at night. My light is about 10in from the water, and I've removed the glass lid about 2 days ago. The water doesn't feel warm to the touch to me...idk?! Oh, my viper light has a fan attached, which I have on at the highest setting, and the ceiling fan on, and the window wide open. I'm also thinking and hoping I have a bad thermometer. Each and every one of my corals are fully open, and happy looking. I guess they said they'll rather deal with warm water instead of oily water in the ocean :)