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I understand that if they are clay they should be ok. I read that D Walstad used them at the end of a tank for a catch area, with potted plants on top. (remove pots, chase fish in, block them in with divider and net without as much damage to plants). I tried this when I set up a 20 g, but used concrete pavers and had to remove them. (No clay bricks in the Home Improvement store at that time). I used clay (terra cotta) pots and they were always growing iron-loving algae, even when I didn't have algae anywhere else. I didn't use either when I set my new tank because of that. Clay pots didn't hold Java moss well enough, but I imagine bricks would because they are rougher. I have sandstone rocks on which it grows.
 
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