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My driftwood was in an infected aquarium with bacterial infection and fungus. Is it safe to use wood after I boil it and how long should it be boiled.

I would not boil it - because boiling will distroy the wood itself

What I would do is keeping the wood dry for a month - prefeably in the full sun. Dryness and UV kill a lot of bacteria and fungi.

Then I would place the wood in a tank without fish, food or light for another month. Any bacerium or fungus - or spore of it - still on the wood will have to survive for this month without any food - and this will be hard on them.

After that, I would use the wood without a second thought. Still, all wood is best kept in a tank with a wood eating Lorricarid. Wood decays, and than it starts to rot. Well, your wood eating Loricarid will eat the rotten wood, getting rid of all the rotting bacteria - preventing it from further rotting.

Thank you. I will do that instead.