I have the same cage. I wouldn't use a super heavy 17"x35" piece of glass which would probably stress your tank's structural integrity. Instead you could have some pieces of plexiglass cut at your local Lowe's or Home depot. Have them cut to the size of the spaces between the plastic frame. You could cover 3 of the 4 spaces and leave the 4th for your heat source. It would also allow for adequate air exchange. I think putting glass on top would be a dangerous mistake. That and I wouldn't want to modify such an expensive cage just because.
Last edited by TheSnakeGuy; 04-27-2013 at 08:50 PM.
I'm actually not using mine. Bought it last year on the black Friday sale and haven't had a use for it yet. Exo Terra makes a lamp that fits in that plastic frame on top. It's only 7" across and made specially for these cages. You can fit 2 of them in each part of the frame if you needed to. This fixture holds up to 150w just like your 8.5". The catch us that this fixture is 29.99$ at PETsMART. It's actually on sale right now for 23.99$. I know because I'm a PETsMART employee.
sweetness!! yea too bad they are $24. Closest petsmart is like 45miles away also...I use a 100watt blue daylight and a 100 watt black night light...cheaper would be awesome lol