I was on a great web site that has tons of info and oneof the things they say about it is that it is very temperature sensitive. Be sure to keep your temp below 79. At 80 it will start to shrivil up.
Here is the web site
www.garf.com
I have had real good luck with wetting the newspaper and draping it on the rock, adding alittle water in the base of the container is not a bad idea as the paper can soak up the extra water.