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It will eat everything in the tank. You can keep crayfish with fish, just not those fish.
 

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Fish aren't fast when they are sleeping :)
 

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The dwarf mexican crayfish is cool. My betta ate a few before I realized I had to provide smaller hiding spots. Crays are vulnerable when they shed their shell.

Well I mean thats true but I guess I got lucky lol
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I hope your luck continues because a couple of months is a really short amount of time...
 

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Yes, having floating cover for the crayfish to work will allow them to catch more fish :)

And yes, they learn new hunting techniques utilizing what's available to them. One of my favorites is using it's food as bait for the fish.
 
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