However you stack them should look very nice. Those rocks will be very hard to stack and keep in place. I have some cobblestones in a tank and I cannot stack them so I use them as accent pieces to all of the flat rock I have. Check out some glue as fishfreaks said, just make sure it is aquarium safe.
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When you feel like this...  , just watch your fish, & have a tasty beverage (of your choice, I like Kool-Aid)!
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