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Strange yellow spots on substrate?


Not so new Member
53A49510-8960-4F6E-AC0C-94E93427C05A.jpeg53A49510-8960-4F6E-AC0C-94E93427C05A.jpegI was rearranging some branches and just checking everything was going good with the enclosure I was setting up (no inhabitants yet, of course),when I noticed little yellow spots on a piece of substrate. I am very concerned, are they spores, mould, fungus or what? I immediately took that handful of substrate out, but I’m worried it is something potentially dangerous (to the future inhabitant). Is it just some ‘off’ thing or should I change out all the substrate? If so, should I continue using that type or change, and to what?