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It's not recommended to place coral or any type of sea shells in a tropical fish tank. Doing so can increase the water's hardness, and may stress the fish. Not all fish like hard water. Plus, coral is a living thing, putting it in freshwater would kill it.

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16y ago
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13y ago

yes, unless its a saltwater thing, then no

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Anonymous

Lvl 1
4y ago

Yes

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Q: Can you put coral in a freshwater fish tank?
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