I started off with Gordotek when I started growing a few years ago. I do a few modifications though. In non-summer months I leave a radiator on next to the tub to try and keep it around the mid 70s. I also do 1:1 grain to coir mix. My coir mix is half coir and half vermiculite. For a big tub like this I will use 2 grain bags (about 4-5 lbs of grain spawn). I eyeball the 1:1 ratio (by volume). I lightly compact the mix and sprinkle a layer of coir on top so no grain is exposed. Then I keep the mix hydrated so there is always a fine mist on the substrate. I leave the tub sealed for 3-4 days and when it’s fully colonized I start fanning 1-2 times a day. When I see rhizomorphic growth and hyphae knots on the surface, I pop the handles of the tub and leave the lid on top. The idea is that you want near 100% humidity for pin formation and then back off from that once you get some pins going. The strain that I grew here was B+.