Hey guys. I am so frustrated. I bought a Compressed brick of what I guess is Coco Fibre from Petstop in Pretoria three or so weeks ago. Now I have been using this same brick for all my T tanks. At first, before I sterilised the Substrate, thye were all getting mold in them. So I took it out and replaced it with "Sterilised" Substrate. Now I normally Nuke it in the Microwave for about 30 seconds and most of my T's cages seem fine except my Biggest Curly hair which seems to have the most mold in it all the time. It only has 1 Piece of Bark-o-Plant that has been sterilized a few times (Now it looks like a old dried up piece of bark) and a Resin Hide with a Plastic Plant. Now a few minutes ago I checked under the hide and their was the dreaded Spider Web Mold. I took it out and threw out the Substrate. Now I am soaking all the Decor and Tank in Hot, hot water and am about to make more substrate from the same brick.

Now my question is how long should I microwave the Substrate? And should I do it after it has been "made" or while it is still in powder form? I am thinking of switching over to Super Fine Vermiculite as a Substrate or is that too fine? Should I go with something a bit more coarse? I am tired of Peat.
EDIT: Forgot to mention that I have a Fish Tank Style lid with a Small hole that I normally keep covered three quarters over it, leaving a small quarter. Could this be due to inadequate ventilation or The Bark-o-Plant? Please help me as this is very frustrating. Oops,just saw that there are two threads. I must have accidentally pressed the Submit button Twice. Please Help Me with this.