You're going to need to get a bigger tank pretty soon, 10gal isn't going to last you long.
You need a thermostat for the UTH, even though the temps are only at 84. I was checking mine, and it's gotten up to 150 degrees unregulated. The reason why the temperature is so low is probably because of the bedding, the heat isn't getting through all the way. The issue is that if your bp decides to dig, it'll get burned. The cheapest "thermostat" is a lamp dimmer, but it's about the biggest pain in the butt ever, since you have to constantly check the temps as they will rise and fall with the room temperature.. One that's highly recommended on this forum is Hydrofarm for heat pads, available on amazon for $30. Once you have a thermostat, remove some of the bedding, or even start with paper towels (makes everything so much easier until you get the hang of it), so that more heat can get through. Good luck