Either the slate or the ceramic tiles will work. There are ways to distribute the weight so they do not damage the glass, although I suspect you won't have to do anything. A layer of sand is one way. I have also seen people use those self adhesive pads designed to go under furniture. Or you can make your own with dabs of silicone in each corner of the tile and one in the middle.



If you're using undertank heat the air space created by these above methods will make the heater less efficient. You'll want the tile in contact with the glass as much as possible. If you're using an over-tank heat source then it won't matter.



Either way, the tiles will take longer to heat up but once up to temperature they will provide a more even and stable heat.



To ease your mind a bit, keep in mind that homes that are heated with radiant heat need extra thermal mass in order to work best. For example, the electric radiant heat mats made for bathrooms actuallly work better under tile than they do vinyl flooring, for example.
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Currently keeping:



6.10 Gonyosoma oxycephalum (Javan, mixed colors)



1.1 Philodryas baroni



1.1 Lampropeltis triangulum multistriata



1.0 Rhodesian Ridgeback

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