Yes you are right, replacing a tank always depends on what fish you have. Always consider an extra space where the fish will have room to grow and roam around.
You could try putting as weight any stone that is not dye or colored for decoration. You could also buy any decoration for tank that has a whole in it just enough to place your wood.
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Looking for the best place for the tank actually depends on the interior of your house. You also need to consider the smells that will come out of the tank when you place it in the living room.
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