Danny, here in Canada coco husk is the chunks, while coco coir/coco fiber/eco earth is the soil like substrate. It's easily confused though as people (even myself sometimes) will use the terms incorrectly.
I'm not a fan of coco coir/eco earth because of how dusty it is when it dries out and also I have found it to be more prone to mold than other substrates just as you have noted. I'd be sticking to the husk chunks in your shoes. Springtails and isopods are available at almost every expo if you ask around.
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