Please get rid of the 13watt bulb--- they are inadequate and can and will cause all.kinds if health issues- get a hood for your T 8- you can use a Zilla hood 18" take the bulb out and put your Reptisun in- leave the cover off the hood install inside the tank it needs to be inside w/ basking decor directly underneath approx 6-8 inches-- do this ASAP
Karrie
Karrie