The main problem revolves around the terpenoids that may be present depending on the type of wood(fir and cedar come to mind). Its less of a problem with aged and well composted wood/bark chips. Terpenoids are harmful to invertebrates and can effect them in a variety of ways. Some people experience zero problems and others are just cautious and avoid it as a rule of thumb. The other issues just revolve around the normal substrate qualms... Too rough, too hard, harbors pests, grows molds and fungi.
i use bark mulchin my Avic.Avic setup. I also have quite a bit of regular topsoil on it so it's kinda mixed the ventilation from the bark mulch below and the air above has mad for no mold in 3 mos...
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