The most common mold I've seen from compressed coco fiber to date has been the yellowish flower pot fungus (Leucocoprinus birnbaumii). It is a known problem in nurseries as the mycelia can make it difficult for the media to absorb water.
Contrary to a number of claims, this fungus is ignored by isopods and springtails and the only real prevention is to sterilize the media before use.
Ed
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