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Bleach is totally safe to use if it is laid out to dry. The chlorine in bleach is a gas in the natural state and will disipate in air. The reason bleach smells is the chlorine gassing off. To most thinking, if a liquid soaks into wood, it also will dry out. For what types of wood to avoid the problem is as much what the wood may do to the water color than how it bothers the fish. The more sap, the more color from tannins you will get. Depending on your water buffering qualities, this may make your PH change. The drier the wood the better for both these. If it still smells, it is suspect, to me. No reason not to try it if it appeals to you but , you may decide later it is not worth waiting for it to stop coloring the water. While you are waiting around for a tank to cycle is a good time to do the bleach soak and then leave the wood in water to see how it goes on color.
This cedar was fine from the start


but this cedar took months to clear


The stains on the glass? They never cleared. I sold them with the tank!
 

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There seems to be a bit of confusion on soft /hard woods. When speaking of lumber many woods like oak,hickory and walnut are called hardwoods. That leaves a lot of others like cedar called soft. When we get into talking driftwood, I want to avoid soft wood but that doesn't mean I need to find one of the "hardwood" lumber types. I want good hard wood in the normal sense, not a builders definition of what is a hardwood. That may not make sense until you find an old cedar snag and try to cut it. What would be called soft by lumber standards is now definitely hard! Many think cedar being a soft wood puts it out of use for aquariums but if you try a truly hard old cedar, it works quite well in water with good buffering. The big cedar stump I had was used as yard decor until I bought the house. It had laid out in the Texas sun for almost 15 years and was totally bone dry and could not be cut with a handsaw. It will last nearly forever in a tank. Or at least longer than I wanted it!
 
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