Also, wood from the beach tends to have a lot of salt and aquired "seasoning" from the ocean so I wouldn't use it. As to putting wood in a 10g, I have a piece in mine with my Kuhlis who all love it. You don't have to boil it or soak it to place it in the tank though it does help reduce the tannins. They won't go away completely even with regular water changes but eventually they won't be noticable at all.