no that doesnt look like mold to me. it looks like roots emerging from axial nodes but i see some browning. make sure the mist has some good baby tears quality ferts lightly in it in my opinion
true mold in a terrarium (essentially what that container is while capped) looks just like bread mold and diluted peroxide works fine as a mist or even just light hand removal of the bad areas. i see no mold here but id get them some ferts and feed before they decline.