I love the idea of the baby Barnacles clustered around in corners or near adult ones. It’s a good way to increase immersion and give certain areas of the game a ‘creepier feel’. I wouldn’t mind if I saw them in Xen or on Earth (As long as on Earth it’s past Residue Processing if only for time-frame feasibility)
It would be a bit easier to implement than some other crazy ideas… Like my underwater one.