What is this white stuff ?

FallenPepper

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Did you wash/boil the wood before putting it in? Could be mold, but I had this when I first bought spider wood and didn't rinse it first though it went away after I took it out and scrubbed it
 

Naughts

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Some spiderwoods can grow a toxic fungus. I would take it out.
Are your fish behaving normally? Is it azalea wood?
I had some from Maidenhead Aquatics that was safe...where was yours from?
 
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