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Discussion Starter · #1 ·
I found some fallen chestnuts today and was considering boiling them up and adding them to my tank for possible tannins and shrimp food. Anybody ever use chestnuts or know if they’re safe or unsafe to use?
 

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It depends on the chestnut. Horse chestnuts (Aesculus hippocastanum) contain saponin and are poisonous to fish, and I would assume shrimp as well. Sweet chestnuts (Castanea sativa) are from a different family, but I'm not sure if they are poisonous to fish/inverts. I would air on the side of caution and not put them in!

-AM

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Discussion Starter · #3 ·
I will pass. Thanks for the help!!
 

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Water chestnuts are very much safe.

Again, best to err* on the side of caution. It might be better to crack the nuts, extract the meat (do whatever you want with that), and then boil the outer shell bit instead.
 
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