Is the wood just introduced in the aquarium? If so it is fungi. Nothing to do, it will go away on its own in a couple of weeks once the bacterial population grows.
BTW some plants seem to have been burned by a ammonia spike. Take out any damaged, mush parts and change the water.
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BTW some plants seem to have been burned by a ammonia spike. Take out any damaged, mush parts and change the water.
Sent from my ONEPLUS A3003 using Tapatalk