What kind of surface basking temps are you getting w/ the basking bulb on top of the screen- I would get rid of the coil NOW - its not doing any good anyway - more harm than good -- he will be fine --- your going to haft to play around w/ the area in question - you want the UVB in the tank so you can set it up in the middle of the tank I am going to post for reference my tank its a 120 gallon tank you can see how I have mine set up and go from there -This is his basking spot. The light in the back is his heat lamp. So once I remove the dome with the uvb, could I mount the new light on the lid in its place.? The tank is 2 feet tall so if it needs to be 8 inches from him, I don't know how to get it closer