WHAT THE HELL IS THIS STUFF?!!??!

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Must've deleted it on accident
 
I'd say fungus, it's happened to me if I don't scrub clean new bits of wood. I'd take out the wood and scrub it all clean.
 
Word I took it out hope it does the trick I was like.. "WHAT THE HELL DID THE LOACHES DO"
 
Probably a mixture of saprophytic bacteria and fungi. It's dead wood after all, saprophytes are to be expected.
 
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