Thats an interesting idea... kinda like the glass pot planters, but using a chunk of wood instead.
I guess styrofoam should be okay, though over time small bits might flake off and fishes might swallow it. Magnet should be okay too, but might slowly release metal content into the water.
Perhaps you could just get those small silicone suction cups from LFS and use them to attach the wood to the glass, it'll work well without any potential issues.








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