Great White Monster is a fake "strain" of mushroom. The real strain of great white monster mushroom is Albino A+ (AA+) and produces beautiful white/cream colored mushrooms. When grown in a bulk application, like a monotub that allows decent FAE, they do thier absolute best, living up to their name. I personally have had 55g mushrooms from the first flush. Seems like they would do much better cased than uncased, if you want monsters, as the casing provides more water for them to absorb.   Here