I thought it was a some kind of stone crab when I first saw him. Now the hairs look more like a gorilla.
I'm thinking I'll do the freezer and be nice. He probably will get killed in the sump when the water change happens. I put room temp water in there and let it heat up until it goes into the DP.
If you don't want it just crush it with your fingers and be gone with it. Or there might be someone close by to you who might need it for thier Mantis shrimp, like said above.
I never kill crabs. Why kill a living creature that was unlucky enough to be in a rock that you took to put in your tank. I always throw them in my sump. No harm to your tank, and no harm to the crab.
CO2 poisoning wouldbe the fastest "humane" way in "unhumane" euthanization of any animal... unless of course you have 90% ethanol lying around somewhere.
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