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I think your way too wet for any tarantulas I know of. But not sure what killed him but the fungi most likely happened after death. At least that what I think.
On most of my sling bottom moist but not saturated. Lets them dig for it it wants. Coco is my best go to for me-Dry's fast resist mold. But on my gbb sling -Dry I water just the web, he covers everything. Have fun