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Dead coral will add sodium and calcium into your water, thus messing up its chemistry. The shape of this coral is very similar to Manzanita Driftwood, and I would recommend that if you want a similar shape.

Cheers,
Justin
 

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It looks like a black coral skeleton. I had one in a freshwater tank for many years. If you soak it in a bucket for a few days the sodium will disappear pretty quick. Calcium carbonate is not very soluble though it will add some hardness to your water. For a tank on the alkaline side you won't get much calcium. If you have fish or shrimp that like alkaline water a little on the hard side, you have no issue.

If you run an acid tank with soft water, it would not be compatible with your water chemistry.
 
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