This product is the perfect shell substrate. It has buffering capabilities superior to oyster shell, coquina shell,calcite,dolomite, and most varieties of beach collected shell because of its unusual mineralogy. Clean and pure; no dangerous impurities or harmful organisms to endanger your aquarium.
I just recently added these shells on top of my aragonite and it makes a great finishing touch. Coolest thing ever is that my cichlids like to move them and seperate the aruba shells from the aragonite. Fun to Watch. JUST MAKE SURE YOU RINSE WELL!!! i didn't do that, and had murky water for a day.
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