i just purchased two 24" glass covers because i ordered new lighting for my system, first question is.. they have a black plastic hinge in the middle will my 2 150 hqo halides and 2 55 watt atinic ps's and 2 36watt 10k pc's melt the plastic? if not, when i placed the glass covers on my tank they where too big by like a millimeter 8O!! is there any way of "sanding" down the glass on the edges to make them fit, or should i return them and just get some glass cut somewhere?