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underwater island

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I'm sure everyone here knows this already, but just in case someone new is reading this thread - it's important to know that fiddler crabs must be kept in brackish water. No matter how they sell them at the store, these crabs will not survive in freshwater for long.


Also important to not overstock (most places recommended a 1:3 male to female ratio, but I had one male that eventually killed all but his one chosen female). They need space to create and defend their territories.

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 My sister did something similar with her outdoor Koi pond but reversed.  She stationed a 2.5 Betta sphere upside down on bricks.  Now the fish can swim up to see the rest of the world. 

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