What are you measuring your temps with? Have you had a chance to pick up some digital thermometer/hygrometers from Walmart yet?
Yes I only got one thermometer per tank thus far. Believe me I'm TRYING very hard to get to where I wanna be. I have only had my BP's for a few weeks now and I spend mucho money every week to get more on point. So... the thermometer I have is a Coralife. You can see exactly what it looks like HERE. I place the probe in the center of the tank right now because I don't have two to messure both sides and I get a reading of about 85degrees.