Hey! I took my ig to the vet in edmonton today to find out what the black spots were on the side of him and they said that it was a fungal infection and gave me some antibiotic to get rid of it so he will be alright. he said it comes from either high or low humidity. he asked what type of flooring i was using and i told him. He suggested some other stuff. it is called "Forest Floor, Expandable Substrate" it is a "T-Rex" product. it helps to keep the humidity level constant is easy to use and is 100 percent organic! it is also highly absorbent and is harmless to them if ingested. and it expands 7 to 8 times its original packaged size so it doesn't take much to fill the bottom of your tank. You guys should check it out. My ig loves to dig and bury himself in it for the wetness and humidity and to hide in without having to go in his cave.you can check it out at www.t-rexproducts.com under the reptile products section and then click on T-rex Substrates. this stuff is awesome. i strongly recommend it for anyone who has a hard time with humidity or with a reptile that likes to dig and bury himself underneath stuff. can someone check it out and tell me what they think?