Hi,
In general, mantis shrimps are bad since they can kill fish and smash snail shells. It took me 2 years to capture mine. I broke my tank down to capture him. At 3 inches in length, it killed quite a few fish.
However, you may have a more common relative of the mantis shrimp, the pistol shrimp. Those are harmless from my readings.
- Victor.
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