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"a lot of air exchange" compared to typical cubensis fruiting conditions can still be inadequate for oysters, they REALLY don't tolerate CO2 buildup well. They'll still fruit, but the mushrooms will be very abundant (tons of pins) and nearly all stem. the caps are much better eating, so extremely good air exchange is crucial to getting nice fruits for cooking with. If I remember right, the fruiting parameters in TMC say something like 4-5 air exchanges per hour. If you have sufficient air exchange, your pins should look something like this, also phoenix oysters: