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Casing a cube is not necessary. Casings can help a cube grow if you are inflicted by very low ambient humidity but generally a sgfc is all you need to fruit cubes.

You should only case the top of the substrate. the casing layer is non-nutritious and will not colonize easily, so it is just put on the top of the substrate at about .5 to 1 cm.

again this is only to give the surface a micro-climate that stays nice and humid. for some mushroom species a casing layer is needed as it will supply the mycelium with necessary and beneficial organisms.. this is not the case with cubensis.

you can put this tray in a sgfc, sgfc is good at fruiting anything cubensis.

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Well said!