Hello all, well i am about to build glass tops fpr my three tanks cuz i am having a hard time keepin the humidity up. So i use both ut heaters and lights on two and one has heat emiter (ceramic) temps seem to be ok little on cool side for ambieant. So the questions r do i need to have a hole in glass where the lamps and the ceramics are, or can they sit on the glass? thx for your help sean