I have an oceanic terrarium (1990's) buy time ito got the top in the house my son broke it. Like into 15 pieces, especially the corners where theres turn locks. I used GE2 and it's held up. But when I used a dome light on it, it cracked more. So that crack may grow with more heat on it. If you're using one hike it up atleast 4 or 5 inches. The florecsent has no effect.