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can perlite be used instead of vermiculite in the rice cakes?

i dont know if the humidity isnt high enough (using ultra sonic humidifier) or there's too much CO2 built up, or the tempature is wrong (steady @ 74 degrees F), but only half my rice cakes have pinned in about 2-3 weeks after placing them in the terrarium, and after pinning they pretty much stop growing. i read somewhere that the humidity should be around 90%, but something else said it should be as high as possible without moisture forming on the cakes. Only 2 formed caps, but stopped growing and shriveled up before reaching an inch long! what the hell?!    somebody please help- any advice is appreciated.. 

i dont know if the humidity isnt high enough (using ultra sonic humidifier) or there's too much CO2 built up, or the tempature is wrong (steady @ 74 degrees F), but only half my rice cakes have pinned in about 2-3 weeks after placing them in the terrarium, and after pinning they pretty much stop growing. i read somewhere that the humidity should be around 90%, but something else said it should be as high as possible without moisture forming on the cakes. Only 2 formed caps, but stopped growing and shriveled up before reaching an inch long! what the hell?!    somebody please help- any advice is appreciated..