Do I need to boil my redwood before I can give it to the aquarium?

No, in no case you should boil it, wash with hot water or solid scrub with the brush! In order to destroy the already biologically treated surface of the root! The previously formed and then destroyed biofilm has now broken down in the aquarium and a new biofilm formed, which leads to increased oxygen consumption in the aquarium. This in turn can cause problems to your animals when the ratio root surface – water quantity the oxygen content is concerning unfavorable.

So please simply wash only in cold or lukewarm water at most. Rests of peat can be carefully removed with a brush.