I was really hoping these would be amazing slate stones but unfortunately I was very disappointed. They were 3-5 inches long but only about 2 inches wide. They are sharp and serrated, some are very thin and don't fold well. I disinfected them in chlorinated water because I was going to put them in my reptile cage anyway, but unfortunately they got quite a few rust spots due to the poor quality of the slate. I would not recommend putting them in an aquarium at all. Too bad I wouldn't have wasted $30 :(
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