Alright, so I just purchased a 125 w exo terra Mercury bulb for a 20 gallon tank with both uvA and uvB. I was using 2 separate bulbs for uvA and B, but the heat bulb was not heating the tank enough so I went from 100w to 125w. The combo bulb seemed like a good idea and had positive reviews on Amazon. Now I am worried my dragon won't get enough uvB from this new bulb. Should I use the separate uvB light as well, or is it possible for my dragon to get too much uvB?