Thankyou sir! I was getting perlite/vermiculite mixed up, i bought vermiculite from bunning not perlite. Found vermiculite on ebay for about $50 per 100 litres.
Me thinks that they made a little mistake with their temps!
Stage Light Lighting Time Dark Time Hanging Height Best Temperature
First 2-4wks (Recovery Stage) MH 18hrs 6hrs Infinity to 18in. 72-76 degree Celsius
Last 8-9wks HPS 12hrs 12hrs 18in. 72-76 degree Celsius
Isn't perlite better though in terms of not breaking down/being crushed as easily??
Ha hadn't noticed the temps thing ... thats one warm grow chamber ....