Thank you very much -- that helps a lot -- now I don't have to drill holes into the sides of my aquarium. I am actually goiing to put repti-carpet down first, and then a thin layer of aspen (I think). I thnk I will just go with a thermometer with a probe that I will mount on the inside...(and place the probe on top of the carpet).

Thanks a lot for the help.

BTW -- how do you "bump" your post up?

Chapskis1