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So at 1.5 cm you are setting the fixture directly on the glass? we are talking centimeters not inches right? sounds to me like it may be weight. does the fixture clear the edges so the weight is on the frame or does it sit on the glass only? you may need thicker glass, but in any case you need to prop the lights up off the top, four t5s will get the glass really hot at that distance. I have my 4' two light strip like at least six inches off the top of my tanks and the temp on top still reaches into the low 80's, i even have a small fan blowing over the tops to keep the glass cool. But as far as the breaking, i would say weight
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