There are also smaller similar ones like rock anemones that I don't think get very big.
I know some consider them pests but they do sorta look neat all grown out together on a rock, for a species tank it could actually look pretty cool. They are much hardier and spread much quicker than any other kind of larger anemone.
I have a 2.5g on my desk which is why I say this- when I contemplate the size compared to other species its like whoa, no way
No, it's not a good idea to attempt.
You could survive in a coffin if you had appropriate air and someone was feeding you, but that also wouldn't be a good idea.
Still not recommended in a 5 gallon.
I've heard of a few people having success keeping them in 12 gallon tanks, but the people with that success often find that the nem quickly outgrows the tank.
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