preping wood for an aquarium will almost always involve boiling the wood to eliminate critters, leach tannins out, make it start sinking and sterilize it of all chemicals. Softwoods like what you have there can be somewhat problamatic in the aquarium as it takes them a long time to sink often requiring slate or weights of some sort. They can also start to rot, removing any loose bark would be a must. The piece you have their looks nice but In my opinion I would go with some sort of hardwood or rootwood specificly for the aquarium as they tend to be less problamatic. The best places to find such things can be local mom and pop stores instead of big name chains.
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Member # 64
90 Gallon Low light/Easy Maintenance