We've only done one clutch so far but everything went fine. Used equal mix of Vermiculite and water. No diffuser just put the eggs in the substrate. We used Press N Seal. Didn't even put the lid back on the tub. We just set it upside down on top so that we could set the T-stat probe on it. Opened the P&S every 4 days for air exchange and then more often towards the end. They pipped on day 56. Our second clutch should be dropping in about a week or so. Just keep everything stable and you should be fine. Good luck