I use both off and on, but like goalcreas, I don't like the battle with BBA on wood. Rocks seem to just get a patina of GSA, which doesn't annoy me as much. On the other hand, a nice piece of wood does provide a lot of interesting places for certain plants to grow.
I notice that when I use wood, it is just a matter of time before most of the wood is hidden in the plants. Rocks seem to be visible longer, but they too tend to eventually be overwhelmed by plants. My next scaping effort will likely include neither wood nor rocks.
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hoppy
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