Struck the top? How big is this hide? Does he just have the one? Ideally you should have 2 identical snug-fitting hides on either side. If it's too big your BP won't feel secure.
I have a 31x19 foot print tank for my girl and use a UTH and lamp at all times (I'm in Canada and it's getting cool). My bulb for that tank is a 60W. I also have a 24x12 footprint tank that I use a 40W bulb in. I have a thermostat for one (cheap hydrofarm) and a dimmer on the other.