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Anonymous
>>259474
The US variety isn't the same species, but they are in the same family, and they are functually identical.
They are OK with some fish, but it's a fine line to tread: Fish are often either small enough to be overpowered by the crawfish, or they are large enough to eat it. The safest method is to stick with larger fish the crawfish won't bother, but to keep a lot of cover in the tank so the crawfish has places to hide. So long as the fish aren't starving they probably won't eat it. I have kept crawfish with caribes in this manner with only rare losses. Keep in mind that they are very inexpensive (often free if you look around a bit), so even if you loose one, it's no big deal.
Then again, OP's fish are small so they'd probably end up as yabbie/crawfish food. Shrimp would be preferable to keep, or keep the crawfish SMALL.
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