Hmm,


Well sadly I've never used that substrate ( I use newspaper) so I'm unsure of what to suggest next but I do have a few questions that might speed up the process of others helping;


How long did you leave it all set up and running before checking those temperatures? and what is your humidity running at?

It does seem to me that an inch of damp substrate will do a fairly good job of insulation but people with more experience of it are far better sources of information.


dr del