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okay so i was thinking of using some bricks to make a cave of some sort in a corner of my tank, is it the same way as testing a rock is able to be used?
If you're using the regular red bricks, I think they're made of nothing but clay. Might want to get some more answers though. They might also start dissolving into your water after a while.
I've seen people use bricks in ponds to raise equipment off the bottom. Red clay is generally iron-rich, which can lead to algae issues. Not sure if it would be a problem with bricks, but it's a thought. That said, if it passes the acid test, I'd use it.