I'm inclined towards the cuttlefish because they are real. They're also quite intelligent and can recognise their owners. One day I'd like to try keeping Sepia bandensis, the dwarf cuttlefish. They're adorable!
Yes, Subnautica's store is run through Redbuble so this must be a rip-off. I'd contact their office about this, but they don't respond to enquiries so I guess it's not staffed to handle unsolicited mail.
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They'll even eat out of your hand.
Look what I found, surely this is not legal
https://www.rageon.com/products/garryfish-subnautica