Ok so I would upgrade your tank now --- the 36" is really too long for your tank -- he will not be able to escape the rays of the UVB w/ out having to hide from it --- so I would cover half the light up w/ a towel etc --- or at least 12" of it up so he can still be out w/ out having to hide from it or put it clear to the the back of the tank on top of screen and have your basking decor piece or pieces under it separately -- he needs to be able to not haft to sit under it all the time -- your decor piece should sit 8-10 inches directly under it -- you may haft to do some dinkin around w/ it when you get it -- I would look at upgrading his tank to a 75 gallon or 120 gallon - a 120 gallon would be a 4x2x2 --- which would give more room for him w/ out the UVB -- I am using a 24" fixture in my 4x2x2 ---
Karrie